Question

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Solve the equation
cos( θ+60◦)=2sinθ

Answer 1

solve for theta?

Answer 2

$$
\Large {
\cos(\theta+60~^o)=2\sinθ
\\\iff \\
\cos(\theta) \cos (60~^o)- \sin(\theta) \sin (60~^o) =2\sinθ
}
$$