?

AP® Calculus AB-BC

Free Version

Upgrade subject to access all content

Moderate

Higher Order Derivatives: The Value of a Third Derivative

APCALC-UP21PF

If $f\left( x \right) =\cos { \left( 2x \right) } $, then $f^{ \prime \prime \prime }\left( \cfrac { \pi }{ 4 } \right) =$

A

$-2$

B

$0$

C

$1$

D

$8$