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Without Graphing the Function, Determine Its Amplitude or Period as Requested

Question 262

Multiple Choice

Without graphing the function, determine its amplitude or period as requested.
- $y = - 4 \cos \frac { 1 } { 3 } x \quad$ Find the amplitude.

A) $\frac { 4 \pi } { 3 }$
B) 4
C) $\frac { \pi } { 4 }$
D) $6 \pi$

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