What is the general solution for cos(x)=0.818 ?

The general solution for cos(x)=0.818 is x=0.61287…+2pin,x=2pi-0.61287…+2pin

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cos(x)=0.818

cos (x) = 0.818

x = 0.61287 \dots + 2 πn, x = 2 π - 0.61287 \dots + 2 πn

Solution steps

cos (x) = 0.818

Apply trig inverse properties

x = arccos (0.818) + 2 πn, x = 2 π - arccos (0.818) + 2 πn

Show solutions in decimal form

x = 0.61287 \dots + 2 πn, x = 2 π - 0.61287 \dots + 2 πn

sin (x) = \frac{150}{212.6} (sin (11 5^{\circ}))

16 cos (2 θ) - 9 = 0

0 = 2 + 3 cos (θ) + cos (2 θ)

sin (2 θ) = cos (θ), 2

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

What is the general solution for cos(x)=0.818 ?
The general solution for cos(x)=0.818 is x=0.61287…+2pin,x=2pi-0.61287…+2pin