What is the general solution for cos(θ)=-0.81 ?

The general solution for cos(θ)=-0.81 is θ=2.51494…+2pin,θ=-2.51494…+2pin

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cos(θ)=-0.81

cos (θ) = - 0.81

θ = 2.51494 \dots + 2 πn, θ = - 2.51494 \dots + 2 πn

Solution steps

cos (θ) = - 0.81

Apply trig inverse properties

θ = arccos (- 0.81) + 2 πn, θ = - arccos (- 0.81) + 2 πn

Show solutions in decimal form

θ = 2.51494 \dots + 2 πn, θ = - 2.51494 \dots + 2 πn

cos (θ) = - 0.44

cos (θ) = - 0.62

2 - 2 sin^{2} (x) = 2 cos^{2} (\frac{x}{2})

cos (4 x) sin (x) = 0

3 cos (3 θ) = 0

What is the general solution for cos(θ)=-0.81 ?
The general solution for cos(θ)=-0.81 is θ=2.51494…+2pin,θ=-2.51494…+2pin