What is the general solution for cos(θ)= 2/7 ?

The general solution for cos(θ)= 2/7 is θ=1.28104…+2pin,θ=2pi-1.28104…+2pin

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cos(θ)= 2/7

cos (θ) = \frac{2}{7}

θ = 1.28104 \dots + 2 πn, θ = 2 π - 1.28104 \dots + 2 πn

Solution steps

cos (θ) = \frac{2}{7}

Apply trig inverse properties

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

Show solutions in decimal form

θ = 1.28104 \dots + 2 πn, θ = 2 π - 1.28104 \dots + 2 πn

8 tan (2 x) - 16 cos (x) = 0

x, sin (2 x) = sin (2 y)

cos (2 π x) = 0

tan (θ) = \frac{7}{- 5}

cos (x) = \frac{9}{41}

What is the general solution for cos(θ)= 2/7 ?
The general solution for cos(θ)= 2/7 is θ=1.28104…+2pin,θ=2pi-1.28104…+2pin