Evaluate
\frac{2\sin(z)}{\left(-\cos(z)+1\right)^{4}}
Differentiate w.r.t. z
\frac{2\left(-4\left(\sin(z)\right)^{2}-\left(\cos(z)\right)^{2}+\cos(z)\right)}{\left(-\cos(z)+1\right)^{5}}
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