Prove that \( \cot \left(\frac{\pi}{4}+\theta\right) \times \cot \left(\frac{\pi}{4}-\theta\righ...

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Prove that
\( \cot \left(\frac{\pi}{4}+\theta\right) \times \cot \left(\frac{\pi}{4}-\theta\right)=1 \)
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