$c=\left(2q\ln\left(q\right)\right)+20$
$\frac{dy}{dx}-\frac{y}{x}=y^9$
$\sqrt{a-7}=a$
$\frac{a^{-9}}{a^{-7}}$
$\frac{1-\cos^2}{\cos+1}$
$x^3-14x$
$sen\left(x\right)sen\left(y\right)dx+cos\left(x\right)cos\left(y\right)dy$
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