What is the general solution for cos(θ)=-6/7 ?

The general solution for cos(θ)=-6/7 is θ=2.60049…+2pin,θ=-2.60049…+2pin

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cos(θ)=-6/7

cos (θ) = - \frac{6}{7}

θ = 2.60049 \dots + 2 πn, θ = - 2.60049 \dots + 2 πn

Solution steps

cos (θ) = - \frac{6}{7}

Apply trig inverse properties

θ = arccos (- \frac{6}{7}) + 2 πn, θ = - arccos (- \frac{6}{7}) + 2 πn

Show solutions in decimal form

θ = 2.60049 \dots + 2 πn, θ = - 2.60049 \dots + 2 πn

sec (θ) = - 5

sin^{3} (x) = \frac{1}{2}

sin (2 x) - 3 cos (x) = 0

5 sin^{2} (x) - sin (x) = 0

3 sin^{2} (2 x) + 7 cos (2 x) - 3 = 0

What is the general solution for cos(θ)=-6/7 ?
The general solution for cos(θ)=-6/7 is θ=2.60049…+2pin,θ=-2.60049…+2pin