evaluate without using table:
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just remember cos^2a +sin^2a = 1 and
cosec^2a =1+cot^2a
cosec^2 - cot^2a =1 and
sina =cos(90-a) &tana= cot(90-a)
and vice versa
cosec^2a =1+cot^2a
cosec^2 - cot^2a =1 and
sina =cos(90-a) &tana= cot(90-a)
and vice versa
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