What is the general solution for 2+4cos(θ)=0 ?

The general solution for 2+4cos(θ)=0 is θ=(2pi)/3+2pin,θ=(4pi)/3+2pin

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2+4cos(θ)=0

2 + 4 cos (θ) = 0

θ = \frac{2 π}{3} + 2 πn, θ = \frac{4 π}{3} + 2 πn

Degrees

θ = 12 0^{\circ} + 36 0^{\circ} n, θ = 24 0^{\circ} + 36 0^{\circ} n

Solution steps

2 + 4 cos (θ) = 0

Move

2

to the right side

2 + 4 cos (θ) = 0

Subtract

2

from both sides

2 + 4 cos (θ) - 2 = 0 - 2

Simplify

4 cos (θ) = - 2

4 cos (θ) = - 2

Divide both sides by

4

4 cos (θ) = - 2

Divide both sides by

4

\frac{4 cos ( θ )}{4} = \frac{- 2}{4}

Simplify

\frac{4 cos ( θ )}{4} = \frac{- 2}{4}

Simplify

\frac{4 cos ( θ )}{4} : cos (θ)

\frac{4 cos ( θ )}{4}

Divide the numbers:

\frac{4}{4} = 1

= cos (θ)

Simplify

\frac{- 2}{4} : - \frac{1}{2}

\frac{- 2}{4}

Apply the fraction rule:

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

= - \frac{2}{4}

Cancel the common factor:

2

= - \frac{1}{2}

cos (θ) = - \frac{1}{2}

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{2 π}{3} + 2 πn, θ = \frac{4 π}{3} + 2 πn

θ = \frac{2 π}{3} + 2 πn, θ = \frac{4 π}{3} + 2 πn

- cos (x) - 4 sin^{2} (x) + 2 = 0

2 sin (t) + cos (2 t) = 0

2 cos^{2} (x) - 1 + cos (x) = 2

23 = csc (x) cot (x)

4 sin^{2} (x) - 4 sin (x) = - 1

What is the general solution for 2+4cos(θ)=0 ?
The general solution for 2+4cos(θ)=0 is θ=(2pi)/3+2pin,θ=(4pi)/3+2pin