Appliquer la formule : $a+\frac{b}{c}$$=\frac{b+ac}{c}$, où $a=r\sec\left(\theta\right)$, $b=dy$, $c=dt$, $a+b/c=\frac{dy}{dt}+r\sec\left(\theta\right)$ et $b/c=\frac{dy}{dt}$
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