What is the general solution for cos(x)=-0.6987 ?

The general solution for cos(x)=-0.6987 is x=2.34437…+2pin,x=-2.34437…+2pin

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cos(x)=-0.6987

cos (x) = - 0.6987

x = 2.34437 \dots + 2 πn, x = - 2.34437 \dots + 2 πn

Degrees

x = 134.32279 \dots^{\circ} + 36 0^{\circ} n, x = - 134.32279 \dots^{\circ} + 36 0^{\circ} n

Solution steps

cos (x) = - 0.6987

Apply trig inverse properties

cos (x) = - 0.6987

General solutions for

cos (x) = - 0.6987

cos (x) = - a \Rightarrow x = arccos (- a) + 2 πn, x = - arccos (- a) + 2 πn

x = arccos (- 0.6987) + 2 πn, x = - arccos (- 0.6987) + 2 πn

x = arccos (- 0.6987) + 2 πn, x = - arccos (- 0.6987) + 2 πn

Show solutions in decimal form

x = 2.34437 \dots + 2 πn, x = - 2.34437 \dots + 2 πn

What is the general solution for cos(x)=-0.6987 ?
The general solution for cos(x)=-0.6987 is x=2.34437…+2pin,x=-2.34437…+2pin