What is the general solution for cos(θ)= 4/5 ?

The general solution for cos(θ)= 4/5 is θ=0.64350…+2pin,θ=2pi-0.64350…+2pin

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cos(θ)= 4/5

cos (θ) = \frac{4}{5}

θ = 0.64350 \dots + 2 πn, θ = 2 π - 0.64350 \dots + 2 πn

Solution steps

cos (θ) = \frac{4}{5}

Apply trig inverse properties

θ = arccos (\frac{4}{5}) + 2 πn, θ = 2 π - arccos (\frac{4}{5}) + 2 πn

Show solutions in decimal form

θ = 0.64350 \dots + 2 πn, θ = 2 π - 0.64350 \dots + 2 πn

cos (\frac{15 π}{4})

cos (θ) = \frac{2}{2}

sin^{2} (\frac{π}{2})

sin (3)

sin (θ) = \frac{3}{5}

What is the general solution for cos(θ)= 4/5 ?
The general solution for cos(θ)= 4/5 is θ=0.64350…+2pin,θ=2pi-0.64350…+2pin