सिद्ध कीजिए कि- \[ \cot \left(\frac{\pi}{4}+\theta\right) \cot \left(\frac{\pi}{4}-\theta\right)...

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सिद्ध कीजिए कि-
\[
\cot \left(\frac{\pi}{4}+\theta\right) \cot \left(\frac{\pi}{4}-\theta\right)=1
\]
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