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• 11th
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• Mathematics
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Q.

pls solve it
The left hand derivative of
\(f(x) =[x] \)sin \((\pi\times) \) at x=K k is an interger, is
(a)  \((-1)^k(k-1)\pi\)       (b) \((-1)^{k-1}(k-1)\pi\)
(c) \((-1)^{k}k\pi\)                  (d) \((-1)^{k-1} k\pi\)