# Need help with find the cartesian equation of a parametric set.

#### Psykik

[FONT=&quot]I have a Lissajous curve with the equations x=cos(2*t) and y=sin(t) for 0<t<2(pi). I need to find thae cartesian equation for this and I am really stuck. Any help is greatly appreciated[/FONT]

#### Idea

trig identity

$$\cos (2t)=1-2 \sin ^2t$$

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