Find an Equation for the Graph $y = 3 \cos \frac { \pi } { 2 } x$

question 220

Multiple Choice

Find an equation for the graph.
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• A) \(y = 3 \cos \frac { \pi } { 2 } x\)
• B) \(y = 3 \cos 2 \pi x\)
• C) \(y = 2 \cos 3 \pi x\)
• D) \(y = 2 \cos \frac { \pi } { 3 } x\)