If $\cos A\sin \left( {A - \frac{\pi }{6}} \right)$ is maximum, then the value of $A$ is equal to
If $\cos A\sin \left( {A - \frac{\pi }{6}} \right)$ is maximum, then the value of $A$ is equal to
- A
$\frac{\pi }{3}$
- B
$\frac{\pi }{4}$
- C
$\frac{\pi }{2}$
- D
None of these
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- [JEE MAIN 2016]
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