सिद्ध कीजिए कि : \( \tan ^{2} \theta+\cot ^{2} \theta=\sec ^{2} \theta \cdot \operatorname{cosec...

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सिद्ध कीजिए कि : \( \tan ^{2} \theta+\cot ^{2} \theta=\sec ^{2} \theta \cdot \operatorname{cosec}^{2} \theta-2 \)
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