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Q. If x=a(@+sin@) and y=a(1-cos@), find dy/dx.
i think the correct ans is 1/a
dy/da = 1-cos@ + @sin@
dx/da= @+sin@ +a(1+cos@) = acos@ +sin@ +2a
dy/dx=(dy/da)/(dx/da) = (asin@ -cos@ +1)/(acos@ + sin@ +2a)
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