The left hand derivative of f(x)=[x]sin...

The left hand derivative of `f(x)=[x]sin(pix)` at `x = k`, `k` is an integer, is

A

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

B

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

C

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

D

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

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The correct Answer is:

A

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