(1/sec^2a-cos^a+1/cosec^2a-sin^a)cos^2asin^2a=1-cos^2asin^2a/1-cos^2asin^2a
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(1/sec²a-cos²a+1/cosec²a-sin²a)cos²asin²a
=(cos²a-cosa+sin²a-sina)cos²asin²a
=(1-cosa-sina)cos²asin²a
=
=(cos²a-cosa+sin²a-sina)cos²asin²a
=(1-cosa-sina)cos²asin²a
=
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