You have an implicit function in the form that can be 'transformed' is an implicit function in the form setting and ...
Find the cartesian form of r^2=sec(2theta)
I know I have to use conversion formulas x=rcos(theta) and y=rsin(theta) but it's not clear to me how. I've been having trouble with this kind of problem and figure I should get help before I run into more trouble down the line. :s Would appreciate help with this.