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Popular Trigonometry >

0.5sin(2t)+1.2>1.45

Solution

0.5 sin (2 t) + 1.2 > 1.45

Solution

\frac{π}{12} + πn < t < \frac{5 π}{12} + πn

Interval Notation

(\frac{π}{12} + πn, \frac{5 π}{12} + πn)

Decimal

0.26179 \dots + πn < t < 1.30899 \dots + πn

Solution steps

0.5 sin (2 t) + 1.2 > 1.45

Multiply both sides by

100

0.5 sin (2 t) + 1.2 > 1.45

To eliminate decimal points, multiply by 10 for every digit after the decimal pointThere are

2

digits to the right of the decimal point, therefore multiply by

100

0.5 sin (2 t) \cdot 100 + 1.2 \cdot 100 > 1.45 \cdot 100

Refine

50 sin (2 t) + 120 > 145

50 sin (2 t) + 120 > 145

Move

120

to the right side

50 sin (2 t) + 120 > 145

Subtract

120

from both sides

50 sin (2 t) + 120 - 120 > 145 - 120

Simplify

50 sin (2 t) > 25

50 sin (2 t) > 25

Divide both sides by

50

50 sin (2 t) > 25

Divide both sides by

50

\frac{50 sin ( 2 t )}{50} > \frac{25}{50}

Simplify

sin (2 t) > \frac{1}{2}

sin (2 t) > \frac{1}{2}

For

sin (x) > a

, if

- 1 \leq a < 1

then

arcsin (a) + 2 πn < x < π - arcsin (a) + 2 πn

arcsin (\frac{1}{2}) + 2 πn < 2 t < π - arcsin (\frac{1}{2}) + 2 πn

a < u < b

then

a < u and u < b

arcsin (\frac{1}{2}) + 2 πn < 2 t and 2 t < π - arcsin (\frac{1}{2}) + 2 πn

arcsin (\frac{1}{2}) + 2 πn < 2 t : t > \frac{π}{12} + πn

arcsin (\frac{1}{2}) + 2 πn < 2 t

Switch sides

2 t > arcsin (\frac{1}{2}) + 2 πn

Simplify

arcsin (\frac{1}{2}) + 2 πn : \frac{π}{6} + 2 πn

arcsin (\frac{1}{2}) + 2 πn

Use the following trivial identity:

arcsin (\frac{1}{2}) = \frac{π}{6}

x 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 arcsin (x) 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} arcsin (x) 0^{\circ} 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ}

= \frac{π}{6} + 2 πn

2 t > \frac{π}{6} + 2 πn

Divide both sides by

2

2 t > \frac{π}{6} + 2 πn

Divide both sides by

2

\frac{2 t}{2} > \frac{\frac{π}{6}}{2} + \frac{2 πn}{2}

Simplify

\frac{2 t}{2} > \frac{\frac{π}{6}}{2} + \frac{2 πn}{2}

Simplify

\frac{2 t}{2} : t

\frac{2 t}{2}

Divide the numbers:

\frac{2}{2} = 1

= t

Simplify

\frac{\frac{π}{6}}{2} + \frac{2 πn}{2} : \frac{π}{12} + πn

\frac{\frac{π}{6}}{2} + \frac{2 πn}{2}

\frac{\frac{π}{6}}{2} = \frac{π}{12}

\frac{\frac{π}{6}}{2}

Apply the fraction rule:

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

= \frac{π}{6 \cdot 2}

Multiply the numbers:

6 \cdot 2 = 12

= \frac{π}{12}

\frac{2 πn}{2} = πn

\frac{2 πn}{2}

Divide the numbers:

\frac{2}{2} = 1

= πn

= \frac{π}{12} + πn

t > \frac{π}{12} + πn

t > \frac{π}{12} + πn

t > \frac{π}{12} + πn

2 t < π - arcsin (\frac{1}{2}) + 2 πn : t < \frac{5 π}{12} + πn

2 t < π - arcsin (\frac{1}{2}) + 2 πn

Simplify

π - arcsin (\frac{1}{2}) + 2 πn : π - \frac{π}{6} + 2 πn

π - arcsin (\frac{1}{2}) + 2 πn

Use the following trivial identity:

arcsin (\frac{1}{2}) = \frac{π}{6}

x 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 arcsin (x) 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} arcsin (x) 0^{\circ} 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ}

= π - \frac{π}{6} + 2 πn

2 t < π - \frac{π}{6} + 2 πn

Divide both sides by

2

2 t < π - \frac{π}{6} + 2 πn

Divide both sides by

2

\frac{2 t}{2} < \frac{π}{2} - \frac{\frac{π}{6}}{2} + \frac{2 πn}{2}

Simplify

\frac{2 t}{2} < \frac{π}{2} - \frac{\frac{π}{6}}{2} + \frac{2 πn}{2}

Simplify

\frac{2 t}{2} : t

\frac{2 t}{2}

Divide the numbers:

\frac{2}{2} = 1

= t

Simplify

\frac{π}{2} - \frac{\frac{π}{6}}{2} + \frac{2 πn}{2} : \frac{π}{2} - \frac{π}{12} + πn

\frac{π}{2} - \frac{\frac{π}{6}}{2} + \frac{2 πn}{2}

\frac{\frac{π}{6}}{2} = \frac{π}{12}

\frac{\frac{π}{6}}{2}

Apply the fraction rule:

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

= \frac{π}{6 \cdot 2}

Multiply the numbers:

6 \cdot 2 = 12

= \frac{π}{12}

\frac{2 πn}{2} = πn

\frac{2 πn}{2}

Divide the numbers:

\frac{2}{2} = 1

= πn

= \frac{π}{2} - \frac{π}{12} + πn

t < \frac{π}{2} - \frac{π}{12} + πn

t < \frac{π}{2} - \frac{π}{12} + πn

Simplify

\frac{π}{2} - \frac{π}{12} : \frac{5 π}{12}

\frac{π}{2} - \frac{π}{12}

Least Common Multiplier of

2, 12 : 12

2, 12

Least Common Multiplier (LCM)

Prime factorization of

2 : 2

2

2

is a prime number, therefore no factorization is possible

= 2

Prime factorization of

12 : 2 \cdot 2 \cdot 3

12

12

divides by

212 = 6 \cdot 2

= 2 \cdot 6

6

divides by

26 = 3 \cdot 2

= 2 \cdot 2 \cdot 3

2, 3

are all prime numbers, therefore no further factorization is possible

= 2 \cdot 2 \cdot 3

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

2

12

= 2 \cdot 2 \cdot 3

Multiply the numbers:

2 \cdot 2 \cdot 3 = 12

= 12

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

12

For

\frac{π}{2} :

multiply the denominator and numerator by

6

\frac{π}{2} = \frac{π 6}{2 \cdot 6} = \frac{π 6}{12}

= \frac{π 6}{12} - \frac{π}{12}

Since the denominators are equal, combine the fractions:

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

= \frac{π 6 - π}{12}

Add similar elements:

6 π - π = 5 π

= \frac{5 π}{12}

t < \frac{5 π}{12} + πn

t < \frac{5 π}{12} + πn

Combine the intervals

t > \frac{π}{12} + πn and t < \frac{5 π}{12} + πn

Merge Overlapping Intervals

\frac{π}{12} + πn < t < \frac{5 π}{12} + πn

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