# precalc

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What are parametric equations?
How would you find the rectangular eq's when given parametric eq's? and how would you find parametric eq's when given rectangular eq's?
for example,
given x=cos4t and y=sin4t (t is between 0 and 2pi) what is the retangular equation?
given y=2x^(2)+4 whatare the parametric equations?

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