APFIVE Derivative Using the Product Rule
If $$y = (x-1) \cos x$$, then at $$x = \displaystyle\frac{\pi}{2}$$, $$\displaystyle\frac{dy}{dx} =$$
A
$$1 - \displaystyle\frac{\pi}{2}$$
B
$$-1$$
C
$$\displaystyle\frac{\pi}{2} - 1$$
D
$$1$$
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