Find the rectangular equation of the curve whose parametric equations are given.
1.x=-cost t, y= sin t
2. x=-sin 2t
y=2 cos 2t
Now I am kind of confused what to for with the the "2t"
For example on number 2 I did
2 cos 2t=y
cos2t=y/2 Would I do know square it but while I would get y^2/4 on one side what would I do on the "other side"?