Question

Find a cartesian equation for the curve and identify its graph. (r^2)(cos(2theta))=1

Answer 1

use this
\[\cos 2 \theta=\cos^2 \theta-\sin^2 \theta\\\]
and for Converting between polar and Cartesian coordinates
\[x=r \cos \theta \ \ \ and \ \ \ y=r \sin \theta\]