What is the slope of the normal line to the graph of at ?

MATHEMATICS · Single correct · AP · Calculus AB · Differentiation: Definition and Fundamental Properties · Differentiation: Definition and Fundamental Properties

Problem

What is the slope of the normal line to the graph of y=cos⁡xy=\cos x at x=π/3x=\pi/3? (a) 23\dfrac{2}{\sqrt3} (b) −32-\dfrac{\sqrt3}{2} (c) −23-\dfrac{2}{\sqrt3} (d) 32\dfrac{\sqrt3}{2}

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