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The int(tan^-1 alpha)^(cot^-1 alpha) (ta...

The `int_(tan^-1 alpha)^(cot^-1 alpha) (tanx)/(tanx+cotx)dx alpha in R` cannot take the value (i) `pi` (ii)`pi/2` (iii)`pi/4` (iv)`-pi/4`

A

`pi`

B

`pi/2`

C

`pi/4`

D

None of these

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