What is the general solution for cos(x)=(8.8)/(13) ?

The general solution for cos(x)=(8.8)/(13) is x=0.82722…+2pin,x=2pi-0.82722…+2pin

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cos(x)=(8.8)/(13)

cos (x) = \frac{8.8}{13}

x = 0.82722 \dots + 2 πn, x = 2 π - 0.82722 \dots + 2 πn

Solution steps

cos (x) = \frac{8.8}{13}

Apply trig inverse properties

x = arccos (\frac{8.8}{13}) + 2 πn, x = 2 π - arccos (\frac{8.8}{13}) + 2 πn

Show solutions in decimal form

x = 0.82722 \dots + 2 πn, x = 2 π - 0.82722 \dots + 2 πn

tan^{2} (θ) + 7 tan (θ) + 8 = 0

cos (4 x) = \frac{2}{3}

- 1 + cos (θ) = cos (2 θ)

3 cos (θ) = 3 sin (- θ)

3 tan (\frac{2 x}{3}) + 1 = 0

What is the general solution for cos(x)=(8.8)/(13) ?
The general solution for cos(x)=(8.8)/(13) is x=0.82722…+2pin,x=2pi-0.82722…+2pin