Apply the trigonometric identity: $1-\cos\left(\theta \right)^2$$=\sin\left(\theta \right)^2$
$\sin\left(x\right)^2$
Why is 1 - cos(x)^2 = sin(x)^2 ?
2
Apply the trigonometric identity: $\sin\left(\theta \right)^2$$=\frac{1-\cos\left(2\theta \right)}{2}$
$\frac{1-\cos\left(2x\right)}{2}$
Final answer to the problem
$\frac{1-\cos\left(2x\right)}{2}$
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