If f (x) =[x] tan (pix ) then f '(k') is...

If `f (x) =[x] tan (pix )` then `f '(k')` is equal to `(k in and [.]` denotes greatest integer function):

A

`(k-1)pi(-1)^(k)`

B

`kpi`

C

`kpi(-1)^(k+1)`

D

`(k-1)pi (-1) ^(k-1)`

Text Solution

Verified by Experts

The correct Answer is:

B

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