What is the general solution for cos(θ)=-0.42 ?

The general solution for cos(θ)=-0.42 is θ=2.00424…+2pin,θ=-2.00424…+2pin

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cos(θ)=-0.42

cos (θ) = - 0.42

θ = 2.00424 \dots + 2 πn, θ = - 2.00424 \dots + 2 πn

Solution steps

cos (θ) = - 0.42

Apply trig inverse properties

θ = arccos (- 0.42) + 2 πn, θ = - arccos (- 0.42) + 2 πn

Show solutions in decimal form

θ = 2.00424 \dots + 2 πn, θ = - 2.00424 \dots + 2 πn

sin (\frac{θ}{2}) + cos (θ) = 1

3 sin (\frac{π}{5} x) = 2

11 = 3 csc^{2} (x) + 7

cos (x) tan (x) = \frac{1}{2}

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

What is the general solution for cos(θ)=-0.42 ?
The general solution for cos(θ)=-0.42 is θ=2.00424…+2pin,θ=-2.00424…+2pin