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i) Prove that: (1-sin2A)/(1+sin2A) = tan...

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))`

A

`secA+tanA`

B

`tan((pi)/(4)-A)`

C

`tan((pi)/(4)+(A)/(2))`

D

`tan((pi)/(4)-(A)/(2))`

Text Solution

Verified by Experts

The correct Answer is:
B
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