\( 2 \sec ^{2} \theta-\sec ^{4} \theta-2 \operatorname{cosec}^{2} \theta+\operatorname{cosec}^{4...

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\( 2 \sec ^{2} \theta-\sec ^{4} \theta-2 \operatorname{cosec}^{2} \theta+\operatorname{cosec}^{4} \theta=\cot ^{4} \theta-\tan ^{4} \theta \)
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