Let \( f(x)=e^{x} \cos x \) and slope of the curve \( y=f(x) \) is maximum at \( x=a \) then \( ...

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Let \( f(x)=e^{x} \cos x \) and slope of the curve \( y=f(x) \) is maximum at \( x=a \) then \( a \) equals
(a) 0
(b) \( \frac{\pi}{2} \)
(c) \( \frac{3 \pi}{2} \)
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