If $f ( x ) = \cos ^ { 2 } ( 2 x ) , \text { find } f ^ { \prime } \left( \frac { \pi } { 3 } \right)$

question 154

Multiple Choice

If $f ( x ) = \cos ^ { 2 } ( 2 x ) , \text { find } f ^ { \prime } \left( \frac { \pi } { 3 } \right)$

• A) \(\sqrt { 3 }\)
• B) \(\frac { \sqrt { 3 } } { 4 }\)
• C)1
• D) \(- 1\)
• E) \(- \sqrt { 3 }\)
• F) \(- \frac { \sqrt { 3 } } { 2 }\)
• G) \(\frac { \sqrt { 3 } } { 2 }\)
• H) \(- \frac { \sqrt { 3 } } { 4 }\)

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