Graph r^2=9cos(2theta)

$r^{2} = 9 \cos (2 θ)$

Using the formula $r^{2} = a^{2} \cos (2 θ)$ or $r^{2} = a^{2} \sin (2 θ)$ , where $a \neq 0$ , graph the lemniscate.

$r^{2} = 9 \cos (2 θ)$

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