Converting Parametric Equations to Cartesian Coordinates

[calcphys92]

Can anyone tell me how to convert this parametric equation to cartesian (x,y)?

r(t)=<2.5+2cos(4t),2.1+1.23sin(4t)>

I've tried so many ways and they're incorrect.

 

[iceblits]

Try isolating the cosine and the sine terms and using sin^2(x)+cos^2(x)=1..ex. sin(4t)=(y-.1)/1.23