Find an Equation for the Graph $y = - 4 \cos \left( \frac { 1 } { 3 } x \right)$

question 86

Multiple Choice

Find an equation for the graph.
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• A) \(y = - 4 \cos \left( \frac { 1 } { 3 } x \right)\)
• B) \(y = - 4 \sin \left( \frac { 1 } { 3 } x \right)\)
• C) \(y = - 4 \cos ( 3 x )\)
• D) \(y = - 4 \sin ( 3 x )\)

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