What is the general solution for 2tan^2(θ)cos(θ)-tan^2(θ)=0 ?

The general solution for 2tan^2(θ)cos(θ)-tan^2(θ)=0 is θ=pin,θ= pi/3+2pin,θ=(5pi)/3+2pin

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2tan^2(θ)cos(θ)-tan^2(θ)=0

Solution

2 tan^{2} (θ) cos (θ) - tan^{2} (θ) = 0

Solution

θ = πn, θ = \frac{π}{3} + 2 πn, θ = \frac{5 π}{3} + 2 πn

Degrees

θ = 0^{\circ} + 18 0^{\circ} n, θ = 6 0^{\circ} + 36 0^{\circ} n, θ = 30 0^{\circ} + 36 0^{\circ} n

Solution steps

2 tan^{2} (θ) cos (θ) - tan^{2} (θ) = 0

Factor

2 tan^{2} (θ) cos (θ) - tan^{2} (θ) : tan^{2} (θ) (2 cos (θ) - 1)

2 tan^{2} (θ) cos (θ) - tan^{2} (θ)

Factor out common term

tan^{2} (θ)

= tan^{2} (θ) (2 cos (θ) - 1)

tan^{2} (θ) (2 cos (θ) - 1) = 0

Solving each part separately

tan^{2} (θ) = 0 or 2 cos (θ) - 1 = 0

tan^{2} (θ) = 0 : θ = πn

tan^{2} (θ) = 0

Apply rule

x^{n} = 0 \Rightarrow x = 0

tan (θ) = 0

General solutions for

tan (θ) = 0

tan (x)

periodicity table with

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} tan (x) 0 \frac{3}{3} 13 \pm \infty - 3 - 1 - \frac{3}{3}

θ = 0 + πn

θ = 0 + πn

Solve

θ = 0 + πn : θ = πn

θ = 0 + πn

0 + πn = πn

θ = πn

θ = πn

2 cos (θ) - 1 = 0 : θ = \frac{π}{3} + 2 πn, θ = \frac{5 π}{3} + 2 πn

2 cos (θ) - 1 = 0

Move

1

to the right side

2 cos (θ) - 1 = 0

Add

1

to both sides

2 cos (θ) - 1 + 1 = 0 + 1

Simplify

2 cos (θ) = 1

2 cos (θ) = 1

Divide both sides by

2

2 cos (θ) = 1

Divide both sides by

2

\frac{2 cos ( θ )}{2} = \frac{1}{2}

Simplify

cos (θ) = \frac{1}{2}

cos (θ) = \frac{1}{2}

General solutions for

cos (θ) = \frac{1}{2}

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}{3} + 2 πn, θ = \frac{5 π}{3} + 2 πn

θ = \frac{π}{3} + 2 πn, θ = \frac{5 π}{3} + 2 πn

Combine all the solutions

θ = πn, θ = \frac{π}{3} + 2 πn, θ = \frac{5 π}{3} + 2 πn

Graph

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Frequently Asked Questions (FAQ)

What is the general solution for 2tan^2(θ)cos(θ)-tan^2(θ)=0 ?
The general solution for 2tan^2(θ)cos(θ)-tan^2(θ)=0 is θ=pin,θ= pi/3+2pin,θ=(5pi)/3+2pin