Prove the following identity (1+2(sin a)(cos a))/(1-2(sin^2 a)=(cos a+sin a)/(cos a-sin a)

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We have to prove that (1+2(sin a)(cos a))/(1-2(sin^2 a)=(cos a+sin a)/(cos a-sin a)

Starting from the left hand side

(1+2(sin a)(cos a))/(1-2(sin a)^2)

replace 1 with (sin...

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