What is the general solution for cos(x)=-0.2 ?

The general solution for cos(x)=-0.2 is x=1.77215…+2pin,x=-1.77215…+2pin

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cos(x)=-0.2

cos (x) = - 0.2

x = 1.77215 \dots + 2 πn, x = - 1.77215 \dots + 2 πn

Solution steps

cos (x) = - 0.2

Apply trig inverse properties

x = arccos (- 0.2) + 2 πn, x = - arccos (- 0.2) + 2 πn

Show solutions in decimal form

x = 1.77215 \dots + 2 πn, x = - 1.77215 \dots + 2 πn

3 cos^{2} (x) - 2 cos (x) - 1 = 0

x, y - \frac{1}{cos ( x )} = 0

2 sin (x) - cos (2 x) = 0

sin^{2} (x) sec (x) = tan^{2} (x)

cos (2 x + \frac{π}{3}) = - \frac{1}{2}

What is the general solution for cos(x)=-0.2 ?
The general solution for cos(x)=-0.2 is x=1.77215…+2pin,x=-1.77215…+2pin