If tan(x+pi/4)=a, then sec^(2)x=...

If `tan(x+pi/4)=a`, then `sec^(2)x`=

A

`1+a^(2)`

B

`(4a)/(a+1)^(2)`

C

`(2(a^(2)+1))/(a+1)^(2)`

D

`((a-1)/(a+1))^(2)`

Verified by Experts

The correct Answer is:

C

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