Convert to Rectangular r^2=cos(x)

$r^{2} = \cos (x)$

Step 1

Since $r^{2} = x^{2} + y^{2}$ , replace $r^{2}$ with $x^{2} + y^{2}$ and $r$ with $\sqrt{x^{2} + y^{2}}$ .

$x^{2} + y^{2} = \cos (x)$

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