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

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

A

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

B

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

C

`(-1)^(k) kpi`

D

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

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The correct Answer is:

A

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