Question

Prove that (1-cosA)(1+cosa)=1/cosecA

Answer 1

Answer:

(1-cosA)(1+cosA)=1/cosecA

1^2-cos^2A=1/cosec^2A

sin^2A=1/cosec^2A

therefore,proved as sin^2A is equal to 1/cosec^2 A

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