Asked by Anna
                (a) Modifying the parametric equations of a unit circle, find parametric equations for the ellipse:
x^2/a^2 + y^2/b^2 = 1
(b) Eliminate the parameter to find a Cartesian equation of the curve
x=2sint; y=4+cost; t >(or equal to) 0
            
        x^2/a^2 + y^2/b^2 = 1
(b) Eliminate the parameter to find a Cartesian equation of the curve
x=2sint; y=4+cost; t >(or equal to) 0
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