Simplify the following :
\[
\frac{\sin (\pi+x) \cos \left(\frac{\pi}{2}+x\right) \tan \left(\fra...
Simplify the following :
\[
\frac{\sin (\pi+x) \cos \left(\frac{\pi}{2}+x\right) \tan \left(\frac{3 \pi}{2}-x\right) \cot (2 \pi-x)}{\sin (2 \pi-x) \cos (2 \pi+x) \operatorname{cosec}(-x) \sin \left(\frac{3 \pi}{2}+x\right)}
\]
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