Find a Cartesian equation relating x and y corresponding to the parametric equations
x=5sin(5 t) y=9cos(5 t)
Write your answer in the form
P(x,y)=0
where P(x,y) is a polynomial in x and y such that the coefficient of y^2 is 25.

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x^2+(25y^2/81)-1 this is the answer I got :/

it does seem rather elliptic doesnt it ...

Thats what I did, I used the ellipse formula but I don't know where I'm going wrong.

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