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[" Q.38.If "x=a(theta-sin theta)" and "y...

[" Q.38.If "x=a(theta-sin theta)" and "y=a(1-cos theta)," determine the value of "((dy)/(dx))_(theta=pi/6)],[" Q.39.If "x=cos3 theta-3cos theta" and "y=sin3 theta-3sin theta," show that "(dy)/(dx)=tan2 theta]

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