Prove that= Tan (4.)OSsinz – InterviewSolution

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Prove that= Tan (4.)OSsinz

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We have to prove that Cos2A/1+sin2A=tan(π/4-A)

Solution:-As shown in attachment...

Formula used :Cos 2x = cos²x- sin²x Sin²x +cos² x =1Sin 2x = 2sin x cos x And (1-tan x)/(1+tan x) = tan (π/4 -x)

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