What is the general solution for cos(x)=-0.3 ?

The general solution for cos(x)=-0.3 is x=1.87548…+2pin,x=-1.87548…+2pin

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cos(x)=-0.3

cos (x) = - 0.3

x = 1.87548 \dots + 2 πn, x = - 1.87548 \dots + 2 πn

Solution steps

cos (x) = - 0.3

Apply trig inverse properties

x = arccos (- 0.3) + 2 πn, x = - arccos (- 0.3) + 2 πn

Show solutions in decimal form

x = 1.87548 \dots + 2 πn, x = - 1.87548 \dots + 2 πn

4 cos (3 θ) = 0

2 sin^{2} (x) + 5 cos (x) + 1 = 0

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

5 sin (5 x) = 0

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

What is the general solution for cos(x)=-0.3 ?
The general solution for cos(x)=-0.3 is x=1.87548…+2pin,x=-1.87548…+2pin