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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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