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# 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

$8$