...you do know the identities for cos 2Θ = ???......
I answered x^2 + y^2 - 1/(x^2-y^2) = 0, but that wasn't correct.
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NO , ....x² - y² = 1 , a hyperbola....you do know the identities for cos 2Θ = ???
keywords: Cartesian,is,theta,for,cos,What,equation,the,What is the Cartesian equation for r^2 cos 2theta = 1
