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12. Trigonometric Functions - 3! 2부

12. Trigonometric Functions / Derivatives of Trig Functions / 문제 10

문제 10

Evaluate $f^{'} (x)$ at $x = \frac{π}{4}$ if $f (x) = \cos x$ .

A

$\frac{1}{2}$

B

$\frac{\sqrt{3}}{2}$

C

$\frac{\sqrt{2}}{2}$

D

$- \frac{\sqrt{2}}{2}$