if cot they a =7/8 evaluate (1+sin theta) (1- sin theta)/(1+cos theta) (1-cos theta
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(1+sinA)(1-sinA)/(1+cosA)(1-cosA)
=1-sin^2/1-cos^2
=cos^2/sin^2
=cot^2A
=(7/8)^2
=49/64
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