# Eliminate paramter

1. Apr 17, 2012

### meson0731

1. The problem statement, all variables and given/known data

Eliminate the parameter and express in x and y

x= 2-3cos2t y= 5+7sin2t

2. Relevant equations

3. The attempt at a solution

I tried changing them in terms of cos^2t and sin^2t. I change the first equation into ((x-5)/6) = cos^2t. But I can't figure out how to change the second one in terms of sin^2t.

2. Apr 17, 2012

### LCKurtz

Use $\cos^2(2t)+\sin^2(2t)=1$.

3. Apr 17, 2012

### meson0731

Ahh thanks didn't know you could do that