$\frac{dy}{dx}=\frac{x}{1+x^2}$
$-500\cdot\infty$
$2x^2+4x+4$
$\frac{\cos\left(x\right)^2}{\sin\left(x\right)}+\frac{-\cos\left(x\right)^2}{1+\frac{\sin\left(x\right)}{\cos\left(x\right)}\cos\left(x\right)}$
$3x\:-\:2y^2p\:x\:5$
$\int\left(\frac{x-9}{x^2-2x-15}\right)dx$
$10-\left(-20\right)$
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