![\bf \begin{cases} x=5cos(t)\implies \frac{x}{5}=cos(t)\\\\ cos^{-1}\left( \frac{x}{5} \right)=cos^{-1}[cos(t)]\\\\ cos^{-1}\left( \frac{x}{5} \right)=\boxed{t}\\ ----------\\ y=5sin(t)\implies y=5sin\left( \boxed{cos^{-1}\left( \frac{x}{5} \right)} \right) \end{cases}](/tpl/images/0204/9294/90ff5.png)
X= 5 cos t, y = 5 sin t
eliminate the perameter...
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