(5) cosec2 theta *tan2theta-1 = tan2 theta
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(cosec²∅-1)*(tan²∅)
(cot²∅)*(tan²∅)
(cos²∅/sin²∅)*(sin²∅/cos²∅)
=cos²∅sin²∅/sin²∅cos²∅
⇒=1
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