i) Prove that: (1-sin2A)/(1+sin2A) = tan^(2)(pi/4-A) ii) If costheta= – InterviewSolution

1.	i) Prove that: (1-sin2A)/(1+sin2A) = tan^(2)(pi/4-A) ii) If costheta=1/2(x+1/x), then prove that: cos2theta=1/2(x^(2)+1/x^(2)) and cos3theta=1/2(x^(3)+1/x^(3))
Answer» `secA+tanA` `TAN((PI)/(4)-A)` `tan((pi)/(4)+(A)/(2))` `tan((pi)/(4)-(A)/(2))` ANSWER :B

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