Factor
\frac{-\cos(\frac{3\left(2\theta -\pi \right)}{2})+8}{4}
Evaluate
\frac{-\cos(\frac{3\left(2\theta -\pi \right)}{2})+8}{4}
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\frac{-\cos(\frac{3\left(2\theta -\pi \right)}{2})+8}{4}
Factor out \frac{1}{4}.
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