[ cosec^2(90-€) - 1 ] × [ 1/sin^2€ - 2 ]
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Answer:
cosec²(90-€)= sec2€
1/sin2€-2 = 1-2sin²€/sin²€
so,
sec²€ -1 × 1-2sin²€/sin²€
= tan²€× cos2€/sin²€
= cos 2€/cos²€
1-2cos²€/cos²€
= sec²€ -2
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