What is the general solution for cos(x)=0.39 ?

The general solution for cos(x)=0.39 is x=1.17016…+2pin,x=2pi-1.17016…+2pin

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cos(x)=0.39

cos (x) = 0.39

x = 1.17016 \dots + 2 πn, x = 2 π - 1.17016 \dots + 2 πn

Solution steps

cos (x) = 0.39

Apply trig inverse properties

x = arccos (0.39) + 2 πn, x = 2 π - arccos (0.39) + 2 πn

Show solutions in decimal form

x = 1.17016 \dots + 2 πn, x = 2 π - 1.17016 \dots + 2 πn

1 - 2 sin (x) = cos (2 x)

cos (x) = 0.89

cos (x) = 0.88

cot (\frac{θ}{2}) = - 1

sin (2 θ) cos (θ) - sin (θ) = 0

What is the general solution for cos(x)=0.39 ?
The general solution for cos(x)=0.39 is x=1.17016…+2pin,x=2pi-1.17016…+2pin