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If 0 lt a lt pi then int(dx)/(1-2acos2x+...

If `0 lt a lt pi` then `int(dx)/(1-2acos2x+a^(2))` is equal to

A

`(1)/(1-a^(2))"tan"^(-1)(t*(1-a)/(a+a))+C`

B

`(2)/(1-a^(2))"tan"^(-1)(t*(1+a)/(1-a))+C`

C

`(1)/(1+a^(2))"tan"^(-1)(t)+C`

D

None of these

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