Derivative Using the Product Rule
Let $$y = (x-1) \cos x$$. What is the value of $$\displaystyle\frac{dy}{dx}$$ at $$x = \displaystyle\frac{\pi}{2}$$?
A
$$-1$$
B
$$1 - \displaystyle\frac{\pi}{2}$$
C
$$\displaystyle\frac{\pi}{2} - 1$$
D
$$1$$
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