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Question

Sketch the graph of the following functions:
y= sin2 x,y = sin x

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Solution

We know that
y=sin2x=1cos2x2=1212 cos2x We have,
y=1212cos2x
y12=12cos2x ...(i)
Shifting the origin at (0,12), we obtain
xX,y=Y+12
Substituting these values in (i), we get
Y= - 12cos 2X.
Thus we draw the graph of Y= cos 2x, adjust the maximum and minimum values to 12 and - 12 and shift it by 12 up to get the required graph.


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