$0.25x^2+10x+800$
$\frac{dv}{dt}=2t+3\quady\left(1\right)=2$
$\int\frac{x^2+4x+1}{\left(x+1\right)\left(x-2\right)}dx$
$\frac{63-20+2}{+2-3}$
$49x^2-121y^2$
$-3x+6,\:si\:x=4$
$x\cdot\frac{dy}{dx}=\frac{sinx}{x}-2y$
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