APFIVE Tangent Line to a Cosine Function
Which of the following is an equation of the line tangent to the graph of $$y = \cos x$$ at $$x = \displaystyle\frac{\pi}{2}$$?
A
$$y = -x + \displaystyle\frac{\pi}{2}$$
B
$$y = -x - \displaystyle\frac{\pi}{2}$$
C
$$y = x - \displaystyle\frac{\pi}{2}$$
D
$$y = x + \displaystyle\frac{\pi}{2}$$
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