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