Find an Equation for the Graph $y = 4 \cos \left( \frac { \pi } { 3 } x \right)$

question 10

Multiple Choice

Find an equation for the graph.
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• A) \(y = 4 \cos \left( \frac { \pi } { 3 } x \right)\)
• B) \(y = 3 \cos \left( \frac { \pi } { 5 } x \right)\)
• C) \(y = 3 \cos ( 5 \pi x )\)
• D) \(y = 5 \cos ( 3 \pi x )\)

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