How do you convert $r = cos (θ)$ $r=cos(theta)$ in rectangular form?

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Answer 1 · 2015-12-04T10:36:17

$x^{2} + y^{2} = x$ $x^2+y^2=x$

Multiply both sides by $r$ $r$ :

$r^{2} = r cos (θ)$ $r^2=rcos(theta)$

Use the formulas $r^{2} = x^{2} + y^{2}$ $r^2=x^2+y^2$ and $x = r cos (θ)$ $x=rcos(theta)$ :

$x^{2} + y^{2} = x$ $x^2+y^2=x$

How do you convert r=cos(theta)r=cos(θ)r=cos(theta) in rectangular form?