can anyone explain problem $1I-3 from problem set 3? That is: "Describe the motions given by each of the following position vector functions, as t
goes from −∞ to ∞. In each case, give the xy-equation of the curve along which P travels,
and tell what part of the curve is actually traced out by P ." The first curve given is r(t) = 2*cos^2 t i + sin^2 t j. I read the solution buit don't quite get the last step

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