Solve cos2-1-2- then -n-m-n- I- Find the value of m-

cos^2θ=1/2 ⇒cos^2θ ( 1/√(2) )^2 ⇒cos^2θ=cos^2π/4 ⇒θ=nπ±π/4,n∈ I ...

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Cos(A+B)Cos(A-B)

Solve cos2θ...

Question

Solve ${cos}^{2} θ = \frac{1}{2}$ , then $θ = n π \pm \frac{π}{m}, n \in I$ . Find the value of $m$ .

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