en

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

Popular Trigonometry >

sqrt(3)cos(θ)-2sin(θ)cos(θ)=0

Solution

3 cos (θ) - 2 sin (θ) cos (θ) = 0

Solution

θ = \frac{π}{2} + 2 πn, θ = \frac{3 π}{2} + 2 πn, θ = \frac{π}{3} + 2 πn, θ = \frac{2 π}{3} + 2 πn

+1

Degrees

θ = 9 0^{\circ} + 36 0^{\circ} n, θ = 27 0^{\circ} + 36 0^{\circ} n, θ = 6 0^{\circ} + 36 0^{\circ} n, θ = 12 0^{\circ} + 36 0^{\circ} n

Solution steps

3 cos (θ) - 2 sin (θ) cos (θ) = 0

Factor

3 cos (θ) - 2 sin (θ) cos (θ) : cos (θ) (3 - 2 sin (θ))

3 cos (θ) - 2 sin (θ) cos (θ)

Factor out common term

cos (θ)

= cos (θ) (3 - 2 sin (θ))

cos (θ) (3 - 2 sin (θ)) = 0

Solving each part separately

cos (θ) = 0 or 3 - 2 sin (θ) = 0

cos (θ) = 0 : θ = \frac{π}{2} + 2 πn, θ = \frac{3 π}{2} + 2 πn

cos (θ) = 0

General solutions for

cos (θ) = 0

cos (x)

periodicity table with

2 πn

cycle:

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

θ = \frac{π}{2} + 2 πn, θ = \frac{3 π}{2} + 2 πn

θ = \frac{π}{2} + 2 πn, θ = \frac{3 π}{2} + 2 πn

3 - 2 sin (θ) = 0 : θ = \frac{π}{3} + 2 πn, θ = \frac{2 π}{3} + 2 πn

3 - 2 sin (θ) = 0

Move

3

to the right side

3 - 2 sin (θ) = 0

Subtract

3

from both sides

3 - 2 sin (θ) - 3 = 0 - 3

Simplify

- 2 sin (θ) = - 3

- 2 sin (θ) = - 3

Divide both sides by

- 2

- 2 sin (θ) = - 3

Divide both sides by

- 2

\frac{- 2 sin ( θ )}{- 2} = \frac{- 3}{- 2}

Simplify

sin (θ) = \frac{3}{2}

sin (θ) = \frac{3}{2}

General solutions for

sin (θ) = \frac{3}{2}

sin (x)

periodicity table with

2 πn

cycle:

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

θ = \frac{π}{3} + 2 πn, θ = \frac{2 π}{3} + 2 πn

θ = \frac{π}{3} + 2 πn, θ = \frac{2 π}{3} + 2 πn

Combine all the solutions

θ = \frac{π}{2} + 2 πn, θ = \frac{3 π}{2} + 2 πn, θ = \frac{π}{3} + 2 πn, θ = \frac{2 π}{3} + 2 πn

Graph

Popular Examples

sec(x)+sin^2(x)+cos^2(x)=tan^2(x)

4sin^2(x)-3=4,sin(2x)-3=0

sin(2x)=5sin(x)

tan(x)=-sqrt(3)+2

3tan(x)-cot(x)=0