<PRE><B>Question 641360</B>
 Determine the amplitude, period and displacement of the function. Then sketch the graph of the function. 
y=20 cos [(1/2)x + (pi/3)]
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Amp: |20| = 20
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Period: (2pi)/(1/2) = 4pi
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Shift: -/3)/(1/2) = -(2/3)pi
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{{{graph(400,400,-6,6,-30,30,20*cos((x/2)+(3.14/3)))}}}
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Cheers,
Stan H.
 
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