Prove that : \[ \cos \left(\frac{3 \pi}{2}+\theta\right) \cos (2 \p...

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Prove that :
\[
\cos \left(\frac{3 \pi}{2}+\theta\right) \cos (2 \pi+\theta)\left[\cot \left(\frac{3 \pi}{2}-\theta\right)+\cot (2 \pi+\theta)\right]=1 \text {. }
\]
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