1.

tanA/1+secA-tanA/1-secA=2cosesA

Answer»

tanA / secA - 1 + tanA / secA + 1

sinA/cosA / 1/ cosA - 1 + sinA/cosA / 1/cosA + 1

on simplifying

sinA / 1 - cosA + sinA / 1 + cosA

sinA + sinA.cosA + sinA - sinA.cosA / 1 - cos2A

2sinA / sin2A

2 / sinA

2cosecA

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