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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 kpi`

D

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

Text Solution

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The correct Answer is:
A
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