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How do you simplify $f (θ) = {cos}^{2} θ - {sin}^{2} θ - cos 2 θ$ $f(theta)=cos^2theta-sin^2theta-cos2theta$ ?

1 Answer

Mar 4, 2018

$f (θ) = 0$ $f(theta)=0$

Explanation:

$\to f (θ) = {cos}^{2} θ - {sin}^{2} θ - cos 2 θ = cos 2 θ - cos 2 θ = 0$ $rarrf(theta)=cos^2theta-sin^2theta-cos2theta=cos2theta-cos2theta=0$

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