Eliminate t to give an equation that relates x and y:

x=cos(t)http://nernst.chem.sfu.ca/adm/jsMath...120/char3B.pngy=sin2(t)−3

y= ??

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- Nov 18th 2008, 09:42 AMgearshifterRelating X and Y
Eliminate t to give an equation that relates x and y:

x=cos(t)http://nernst.chem.sfu.ca/adm/jsMath...120/char3B.pngy=sin2(t)−3

y= ?? - Nov 18th 2008, 11:01 AMAryth
Remember the identity:

So:

Now we look at x:

Square both sides:

Multiply both sides by -1:

Now, subtract both sides by 2:

We know that:

So, we get:

And there you go. - Nov 18th 2008, 11:16 AMearboth
- Nov 18th 2008, 08:55 PMgearshifter
wow thanks. I was stuck on that for sometime because i didnt know how to relate it!