What is the general solution for sin(40+x)=cos(5x+10) ?

The general solution for sin(40+x)=cos(5x+10) is x=(6480n+900-180)/(108),x=-(900+6480n+180)/(72)

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Popular Trigonometry >

sin(40+x)=cos(5x+10)

Solution

sin (4 0^{\circ} + x) = cos (5 x + 10)

Solution

x = \frac{648 0 ^{\circ} n + 90 0 ^{\circ} - 180}{108}, x = - \frac{90 0 ^{\circ} + 648 0 ^{\circ} n + 180}{72}

Radians

x = \frac{5 π}{108} - \frac{5}{3} + \frac{36 π}{108} n, x = - \frac{5}{2} - \frac{5 π}{72} - \frac{36 π}{72} n

Solution steps

sin (4 0^{\circ} + x) = cos (5 x + 10)

Rewrite using trig identities

sin (4 0^{\circ} + x) = cos (5 x + 10)

Use the following identity:

cos (x) = sin (9 0^{\circ} - x)

sin (4 0^{\circ} + x) = sin (9 0^{\circ} - (5 x + 10))

sin (4 0^{\circ} + x) = sin (9 0^{\circ} - (5 x + 10))

Apply trig inverse properties

sin (4 0^{\circ} + x) = sin (9 0^{\circ} - (5 x + 10))

sin (x) = sin (y) \Rightarrow x = y + 2 π n, x = π - y + 2 π n

4 0^{\circ} + x = 9 0^{\circ} - (5 x + 10) + 36 0^{\circ} n, 4 0^{\circ} + x = 18 0^{\circ} - (9 0^{\circ} - (5 x + 10)) + 36 0^{\circ} n

4 0^{\circ} + x = 9 0^{\circ} - (5 x + 10) + 36 0^{\circ} n, 4 0^{\circ} + x = 18 0^{\circ} - (9 0^{\circ} - (5 x + 10)) + 36 0^{\circ} n

4 0^{\circ} + x = 9 0^{\circ} - (5 x + 10) + 36 0^{\circ} n : x = \frac{648 0 ^{\circ} n + 90 0 ^{\circ} - 180}{108}

4 0^{\circ} + x = 9 0^{\circ} - (5 x + 10) + 36 0^{\circ} n

Expand

9 0^{\circ} - (5 x + 10) + 36 0^{\circ} n : 9 0^{\circ} - 5 x - 10 + 36 0^{\circ} n

9 0^{\circ} - (5 x + 10) + 36 0^{\circ} n

- (5 x + 10) : - 5 x - 10

- (5 x + 10)

Distribute parentheses

= - (5 x) - (10)

Apply minus-plus rules

+ (- a) = - a

= - 5 x - 10

= 9 0^{\circ} - 5 x - 10 + 36 0^{\circ} n

4 0^{\circ} + x = 9 0^{\circ} - 5 x - 10 + 36 0^{\circ} n

Move

4 0^{\circ}

to the right side

4 0^{\circ} + x = 9 0^{\circ} - 5 x - 10 + 36 0^{\circ} n

Subtract

4 0^{\circ}

from both sides

4 0^{\circ} + x - 4 0^{\circ} = 9 0^{\circ} - 5 x - 10 + 36 0^{\circ} n - 4 0^{\circ}

Simplify

4 0^{\circ} + x - 4 0^{\circ} = 9 0^{\circ} - 5 x - 10 + 36 0^{\circ} n - 4 0^{\circ}

Simplify

4 0^{\circ} + x - 4 0^{\circ} : x

4 0^{\circ} + x - 4 0^{\circ}

Add similar elements:

4 0^{\circ} - 4 0^{\circ} = 0

= x

Simplify

9 0^{\circ} - 5 x - 10 + 36 0^{\circ} n - 4 0^{\circ} : - 5 x + 36 0^{\circ} n + 5 0^{\circ} - 10

9 0^{\circ} - 5 x - 10 + 36 0^{\circ} n - 4 0^{\circ}

Group like terms

= - 5 x + 36 0^{\circ} n + 9 0^{\circ} - 4 0^{\circ} - 10

Combine the fractions

9 0^{\circ} - 4 0^{\circ} : 5 0^{\circ}

9 0^{\circ} - 4 0^{\circ}

Least Common Multiplier of

2, 9 : 18

2, 9

Least Common Multiplier (LCM)

Prime factorization of

2 : 2

2

2

is a prime number, therefore no factorization is possible

= 2

Prime factorization of

9 : 3 \cdot 3

9

9

divides by

39 = 3 \cdot 3

= 3 \cdot 3

Multiply each factor the greatest number of times it occurs in either

2

9

= 2 \cdot 3 \cdot 3

Multiply the numbers:

2 \cdot 3 \cdot 3 = 18

= 18

Adjust Fractions based on the LCM

Multiply each numerator by the same amount needed to multiply its

corresponding denominator to turn it into the LCM

18

For

9 0^{\circ} :

multiply the denominator and numerator by

9

9 0^{\circ} = \frac{18 0 ^{\circ} 9}{2 \cdot 9} = 9 0^{\circ}

For

4 0^{\circ} :

multiply the denominator and numerator by

2

4 0^{\circ} = \frac{36 0 ^{\circ} 2}{9 \cdot 2} = 4 0^{\circ}

= 9 0^{\circ} - 4 0^{\circ}

Since the denominators are equal, combine the fractions:

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{18 0 ^{\circ} 9 - 72 0 ^{\circ}}{18}

Add similar elements:

162 0^{\circ} - 72 0^{\circ} = 90 0^{\circ}

= 5 0^{\circ}

= - 5 x + 36 0^{\circ} n + 5 0^{\circ} - 10

x = - 5 x + 36 0^{\circ} n + 5 0^{\circ} - 10

x = - 5 x + 36 0^{\circ} n + 5 0^{\circ} - 10

x = - 5 x + 36 0^{\circ} n + 5 0^{\circ} - 10

Move

5 x

to the left side

x = - 5 x + 36 0^{\circ} n + 5 0^{\circ} - 10

Add

5 x

to both sides

x + 5 x = - 5 x + 36 0^{\circ} n + 5 0^{\circ} - 10 + 5 x

Simplify

6 x = 36 0^{\circ} n + 5 0^{\circ} - 10

6 x = 36 0^{\circ} n + 5 0^{\circ} - 10

Divide both sides by

6

6 x = 36 0^{\circ} n + 5 0^{\circ} - 10

Divide both sides by

6

\frac{6 x}{6} = \frac{36 0 ^{\circ} n}{6} + \frac{5 0 ^{\circ}}{6} - \frac{10}{6}

Simplify

\frac{6 x}{6} = \frac{36 0 ^{\circ} n}{6} + \frac{5 0 ^{\circ}}{6} - \frac{10}{6}

Simplify

\frac{6 x}{6} : x

\frac{6 x}{6}

Divide the numbers:

\frac{6}{6} = 1

= x

Simplify

\frac{36 0 ^{\circ} n}{6} + \frac{5 0 ^{\circ}}{6} - \frac{10}{6} : \frac{648 0 ^{\circ} n + 90 0 ^{\circ} - 180}{108}

\frac{36 0 ^{\circ} n}{6} + \frac{5 0 ^{\circ}}{6} - \frac{10}{6}

Apply rule

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{36 0 ^{\circ} n + 5 0 ^{\circ} - 10}{6}

Join

36 0^{\circ} n + 5 0^{\circ} - 10 : \frac{648 0 ^{\circ} n + 90 0 ^{\circ} - 180}{18}

36 0^{\circ} n + 5 0^{\circ} - 10

Convert element to fraction:

36 0^{\circ} n = \frac{36 0 ^{\circ} n 18}{18}, 10 = \frac{10 \cdot 18}{18}

= \frac{36 0 ^{\circ} n \cdot 18}{18} + 5 0^{\circ} - \frac{10 \cdot 18}{18}

Since the denominators are equal, combine the fractions:

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{36 0 ^{\circ} n \cdot 18 + 90 0 ^{\circ} - 10 \cdot 18}{18}

36 0^{\circ} n \cdot 18 + 90 0^{\circ} - 10 \cdot 18 = 648 0^{\circ} n + 90 0^{\circ} - 180

36 0^{\circ} n \cdot 18 + 90 0^{\circ} - 10 \cdot 18

Multiply the numbers:

2 \cdot 18 = 36

= 648 0^{\circ} n + 90 0^{\circ} - 10 \cdot 18

Multiply the numbers:

10 \cdot 18 = 180

= 648 0^{\circ} n + 90 0^{\circ} - 180

= \frac{648 0 ^{\circ} n + 90 0 ^{\circ} - 180}{18}

= \frac{\frac{648 0 ^{\circ} n + 90 0 ^{\circ} - 180}{18}}{6}

Apply the fraction rule:

\frac{\frac{b}{c}}{a} = \frac{b}{c \cdot a}

= \frac{648 0 ^{\circ} n + 90 0 ^{\circ} - 180}{18 \cdot 6}

Multiply the numbers:

18 \cdot 6 = 108

= \frac{648 0 ^{\circ} n + 90 0 ^{\circ} - 180}{108}

x = \frac{648 0 ^{\circ} n + 90 0 ^{\circ} - 180}{108}

x = \frac{648 0 ^{\circ} n + 90 0 ^{\circ} - 180}{108}

x = \frac{648 0 ^{\circ} n + 90 0 ^{\circ} - 180}{108}

4 0^{\circ} + x = 18 0^{\circ} - (9 0^{\circ} - (5 x + 10)) + 36 0^{\circ} n : x = - \frac{90 0 ^{\circ} + 648 0 ^{\circ} n + 180}{72}

4 0^{\circ} + x = 18 0^{\circ} - (9 0^{\circ} - (5 x + 10)) + 36 0^{\circ} n

Expand

18 0^{\circ} - (9 0^{\circ} - (5 x + 10)) + 36 0^{\circ} n : 18 0^{\circ} - 9 0^{\circ} + 5 x + 10 + 36 0^{\circ} n

18 0^{\circ} - (9 0^{\circ} - (5 x + 10)) + 36 0^{\circ} n

- (5 x + 10) : - 5 x - 10

- (5 x + 10)

Distribute parentheses

= - (5 x) - (10)

Apply minus-plus rules

+ (- a) = - a

= - 5 x - 10

= 18 0^{\circ} - (- 5 x + 9 0^{\circ} - 10) + 36 0^{\circ} n

- (9 0^{\circ} - 5 x - 10) : - 9 0^{\circ} + 5 x + 10

- (9 0^{\circ} - 5 x - 10)

Distribute parentheses

= - (9 0^{\circ}) - (- 5 x) - (- 10)

Apply minus-plus rules

- (- a) = a, - (a) = - a

= - 9 0^{\circ} + 5 x + 10

= 18 0^{\circ} - 9 0^{\circ} + 5 x + 10 + 36 0^{\circ} n

4 0^{\circ} + x = 18 0^{\circ} - 9 0^{\circ} + 5 x + 10 + 36 0^{\circ} n

Move

4 0^{\circ}

to the right side

4 0^{\circ} + x = 18 0^{\circ} - 9 0^{\circ} + 5 x + 10 + 36 0^{\circ} n

Subtract

4 0^{\circ}

from both sides

4 0^{\circ} + x - 4 0^{\circ} = 18 0^{\circ} - 9 0^{\circ} + 5 x + 10 + 36 0^{\circ} n - 4 0^{\circ}

Simplify

4 0^{\circ} + x - 4 0^{\circ} = 18 0^{\circ} - 9 0^{\circ} + 5 x + 10 + 36 0^{\circ} n - 4 0^{\circ}

Simplify

4 0^{\circ} + x - 4 0^{\circ} : x

4 0^{\circ} + x - 4 0^{\circ}

Add similar elements:

4 0^{\circ} - 4 0^{\circ} = 0

= x

Simplify

18 0^{\circ} - 9 0^{\circ} + 5 x + 10 + 36 0^{\circ} n - 4 0^{\circ} : 5 x + 18 0^{\circ} + 36 0^{\circ} n - 13 0^{\circ} + 10

18 0^{\circ} - 9 0^{\circ} + 5 x + 10 + 36 0^{\circ} n - 4 0^{\circ}

Group like terms

= 5 x + 18 0^{\circ} + 36 0^{\circ} n - 9 0^{\circ} - 4 0^{\circ} + 10

Combine the fractions

- 9 0^{\circ} - 4 0^{\circ} : - 13 0^{\circ}

- 9 0^{\circ} - 4 0^{\circ}

Least Common Multiplier of

2, 9 : 18

2, 9

Least Common Multiplier (LCM)

Prime factorization of

2 : 2

2

2

is a prime number, therefore no factorization is possible

= 2

Prime factorization of

9 : 3 \cdot 3

9

9

divides by

39 = 3 \cdot 3

= 3 \cdot 3

Multiply each factor the greatest number of times it occurs in either

2

9

= 2 \cdot 3 \cdot 3

Multiply the numbers:

2 \cdot 3 \cdot 3 = 18

= 18

Adjust Fractions based on the LCM

Multiply each numerator by the same amount needed to multiply its

corresponding denominator to turn it into the LCM

18

For

9 0^{\circ} :

multiply the denominator and numerator by

9

9 0^{\circ} = \frac{18 0 ^{\circ} 9}{2 \cdot 9} = 9 0^{\circ}

For

4 0^{\circ} :

multiply the denominator and numerator by

2

4 0^{\circ} = \frac{36 0 ^{\circ} 2}{9 \cdot 2} = 4 0^{\circ}

= - 9 0^{\circ} - 4 0^{\circ}

Since the denominators are equal, combine the fractions:

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{- 18 0 ^{\circ} 9 - 72 0 ^{\circ}}{18}

Add similar elements:

- 162 0^{\circ} - 72 0^{\circ} = - 234 0^{\circ}

= \frac{- 234 0 ^{\circ}}{18}

Apply the fraction rule:

\frac{- a}{b} = - \frac{a}{b}

= - 13 0^{\circ}

= 5 x + 18 0^{\circ} + 36 0^{\circ} n - 13 0^{\circ} + 10

x = 5 x + 18 0^{\circ} + 36 0^{\circ} n - 13 0^{\circ} + 10

x = 5 x + 18 0^{\circ} + 36 0^{\circ} n - 13 0^{\circ} + 10

x = 5 x + 18 0^{\circ} + 36 0^{\circ} n - 13 0^{\circ} + 10

Move

5 x

to the left side

x = 5 x + 18 0^{\circ} + 36 0^{\circ} n - 13 0^{\circ} + 10

Subtract

5 x

from both sides

x - 5 x = 5 x + 18 0^{\circ} + 36 0^{\circ} n - 13 0^{\circ} + 10 - 5 x

Simplify

- 4 x = 18 0^{\circ} + 36 0^{\circ} n - 13 0^{\circ} + 10

- 4 x = 18 0^{\circ} + 36 0^{\circ} n - 13 0^{\circ} + 10

Divide both sides by

- 4

- 4 x = 18 0^{\circ} + 36 0^{\circ} n - 13 0^{\circ} + 10

Divide both sides by

- 4

\frac{- 4 x}{- 4} = \frac{18 0 ^{\circ}}{- 4} + \frac{36 0 ^{\circ} n}{- 4} - \frac{13 0 ^{\circ}}{- 4} + \frac{10}{- 4}

Simplify

\frac{- 4 x}{- 4} = \frac{18 0 ^{\circ}}{- 4} + \frac{36 0 ^{\circ} n}{- 4} - \frac{13 0 ^{\circ}}{- 4} + \frac{10}{- 4}

Simplify

\frac{- 4 x}{- 4} : x

\frac{- 4 x}{- 4}

Apply the fraction rule:

\frac{- a}{- b} = \frac{a}{b}

= \frac{4 x}{4}

Divide the numbers:

\frac{4}{4} = 1

= x

Simplify

\frac{18 0 ^{\circ}}{- 4} + \frac{36 0 ^{\circ} n}{- 4} - \frac{13 0 ^{\circ}}{- 4} + \frac{10}{- 4} : - \frac{90 0 ^{\circ} + 648 0 ^{\circ} n + 180}{72}

\frac{18 0 ^{\circ}}{- 4} + \frac{36 0 ^{\circ} n}{- 4} - \frac{13 0 ^{\circ}}{- 4} + \frac{10}{- 4}

Group like terms

= \frac{18 0 ^{\circ}}{- 4} + \frac{10}{- 4} + \frac{36 0 ^{\circ} n}{- 4} - \frac{13 0 ^{\circ}}{- 4}

Apply rule

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{18 0 ^{\circ} + 10 + 36 0 ^{\circ} n - 13 0 ^{\circ}}{- 4}

Apply the fraction rule:

\frac{a}{- b} = - \frac{a}{b}

= - \frac{18 0 ^{\circ} + 10 + 36 0 ^{\circ} n - 13 0 ^{\circ}}{4}

Join

18 0^{\circ} + 10 + 36 0^{\circ} n - 13 0^{\circ} : \frac{90 0 ^{\circ} + 648 0 ^{\circ} n + 180}{18}

18 0^{\circ} + 10 + 36 0^{\circ} n - 13 0^{\circ}

Convert element to fraction:

18 0^{\circ} = 18 0^{\circ}, 10 = \frac{10 \cdot 18}{18}, 36 0^{\circ} n = \frac{36 0 ^{\circ} n 18}{18}

= 18 0^{\circ} + \frac{10 \cdot 18}{18} + \frac{36 0 ^{\circ} n \cdot 18}{18} - 13 0^{\circ}

Since the denominators are equal, combine the fractions:

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{18 0 ^{\circ} 18 + 10 \cdot 18 + 36 0 ^{\circ} n \cdot 18 - 234 0 ^{\circ}}{18}

18 0^{\circ} 18 + 10 \cdot 18 + 36 0^{\circ} n \cdot 18 - 234 0^{\circ} = 90 0^{\circ} + 648 0^{\circ} n + 180

18 0^{\circ} 18 + 10 \cdot 18 + 36 0^{\circ} n \cdot 18 - 234 0^{\circ}

Group like terms

= 324 0^{\circ} - 234 0^{\circ} + 2 \cdot 324 0^{\circ} n + 10 \cdot 18

Add similar elements:

324 0^{\circ} - 234 0^{\circ} = 90 0^{\circ}

= 90 0^{\circ} + 2 \cdot 324 0^{\circ} n + 10 \cdot 18

Multiply the numbers:

2 \cdot 18 = 36

= 90 0^{\circ} + 648 0^{\circ} n + 10 \cdot 18

Multiply the numbers:

10 \cdot 18 = 180

= 90 0^{\circ} + 648 0^{\circ} n + 180

= \frac{90 0 ^{\circ} + 648 0 ^{\circ} n + 180}{18}

= - \frac{\frac{90 0 ^{\circ} + 648 0 ^{\circ} n + 180}{18}}{4}

Simplify

\frac{\frac{90 0 ^{\circ} + 648 0 ^{\circ} n + 180}{18}}{4} : \frac{90 0 ^{\circ} + 648 0 ^{\circ} n + 180}{72}

\frac{\frac{90 0 ^{\circ} + 648 0 ^{\circ} n + 180}{18}}{4}

Apply the fraction rule:

\frac{\frac{b}{c}}{a} = \frac{b}{c \cdot a}

= \frac{90 0 ^{\circ} + 648 0 ^{\circ} n + 180}{18 \cdot 4}

Multiply the numbers:

18 \cdot 4 = 72

= \frac{90 0 ^{\circ} + 648 0 ^{\circ} n + 180}{72}

= - \frac{90 0 ^{\circ} + 648 0 ^{\circ} n + 180}{72}

x = - \frac{90 0 ^{\circ} + 648 0 ^{\circ} n + 180}{72}

x = - \frac{90 0 ^{\circ} + 648 0 ^{\circ} n + 180}{72}

x = - \frac{90 0 ^{\circ} + 648 0 ^{\circ} n + 180}{72}

x = \frac{648 0 ^{\circ} n + 90 0 ^{\circ} - 180}{108}, x = - \frac{90 0 ^{\circ} + 648 0 ^{\circ} n + 180}{72}

x = \frac{648 0 ^{\circ} n + 90 0 ^{\circ} - 180}{108}, x = - \frac{90 0 ^{\circ} + 648 0 ^{\circ} n + 180}{72}

Graph

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Frequently Asked Questions (FAQ)

What is the general solution for sin(40+x)=cos(5x+10) ?
The general solution for sin(40+x)=cos(5x+10) is x=(6480n+900-180)/(108),x=-(900+6480n+180)/(72)