Consider the Function $$y = 9 \cos \left( 8 x - \frac { \pi } { 3 } \right)$$

question 21

Multiple Choice

Consider the function $$y = 9 \cos \left( 8 x - \frac { \pi } { 3 } \right)$$ . Specify the amplitude.

• A) \[18\]
• B) \[3\]
• C) \[\frac { 9 } { 8 }\]
• D) \[9\]
• E) \[\frac { 8 } { 9 }\]

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