tan^(-1)(cotx)...

`tan^(-1)(cotx)`

A

`f(x)` is periodic with period `pi`

B

f(x) is discontinuous at `x=(pi)/2, (3pi)/2`

C

f(x) is not differential at `x= pi , 99 pi , 100 pi `

D

`f'(x)=-1`, for `2n pi lt x lt (2n+1)pi`

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The correct Answer is:

A, C, D

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