1-tan squaredA divided by 1+cot squared A
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Answer:
1-tan^2A/1+cot^2A
=1-tan^2A/cosec^2A
=1-tan^2A/1/sin^2A
=[1-tan^2A] sin^2A
=sin^2A-sin^4A/cos^2A
and it continues on
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