APFIVE Derivative of a Product at a Point
If $$y = 3x \sin x$$, then at $$x = \displaystyle\frac{\pi}{2}$$, $$\displaystyle\frac{dy}{dx} =$$
A
$$6$$
B
$$0$$
C
$$3$$
D
$$\displaystyle\frac{3\pi}{2}$$
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