$121x^2+44xy+4y^2$
$-81-\left(-3\right)$
$\lim_{x\to\infty}\left(\frac{x^3+3x^2+3x+1}{x^3+2}\right)$
$\int tan\left(2x+1\right)dx$
$-10\cdot\left(-7\right)$
$y^'=\frac{y}{1+x^2}$
$\frac{dy}{dx}=\frac{4x}{y^2}$
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