F-WTB/rectEquation.md Secret

Last active September 10, 2021 06:40

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rectEquation.md

$\begin{align*} & x:y=(d-y):(c-x) \\ \Leftrightarrow& x(c-x)=y(d-y) \\ \Leftrightarrow& [x(c-x)+y^2]=dy \\ \Leftrightarrow& [x(c-x)+y^2]^2=d^2y^2 \\ \therefore& [x(c-x)+a^2-x^2]^2=d^2(a^2-x^2) \end{align*}$

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