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

The general solution for cos(x)=-0.39 is x=1.97142…+2pin,x=-1.97142…+2pin

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cos(x)=-0.39

cos (x) = - 0.39

x = 1.97142 \dots + 2 πn, x = - 1.97142 \dots + 2 πn

Degrees

x = 112.95449 \dots^{\circ} + 36 0^{\circ} n, x = - 112.95449 \dots^{\circ} + 36 0^{\circ} n

Solution steps

cos (x) = - 0.39

Apply trig inverse properties

cos (x) = - 0.39

General solutions for

cos (x) = - 0.39

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

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

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

Show solutions in decimal form

x = 1.97142 \dots + 2 πn, x = - 1.97142 \dots + 2 πn

7 tan (θ) + 4 = 0

tan (x - 6 0^{\circ}) = - 1.26, 0^{\circ} \leq x \leq 36 0^{\circ}

0 = 1.5961 \cdot cos (x) + 0.0422 \cdot cos (2 \cdot x)

6 cos (7 θ) = 0

csc^{2} (θ) = 3 cot (θ) + 5

What is the general solution for cos(x)=-0.39 ?
The general solution for cos(x)=-0.39 is x=1.97142…+2pin,x=-1.97142…+2pin