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\operatorname { sec } ^ { 2 } A - \operatorname { sec } ^ { 4 } A - 2 \operatorname { cosec } ^ { 2 } A + \operatorname { cosec } ^ { 4 } A = \operatorname { cot } ^ { 4 } A - \operatorname { tan } ^ { 4 } A |
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Answer» not able to understand Rearrange the terms : 1st step Use identity: 2nd step |
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