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If f"(x) > 0 and f(1) = 0 such that `g(x) = f(cot^2x + 2cotx + 2) where 0 < x < pi`, then g'(x) decreasing in (a, b). where `a + b + pi/4`…

A

`(0,pi)`

B

`((pi)/(2),pi)`

C

`((3pi)/(4),pi)`

D

`(0,(3pi)/(4))`

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