$-x^2-x$
$19-12.\left(-5\right)$
$\tan^2a=\sin2b$
$\lim_{x\to-1}\left(\frac{x^2+9x+8}{x^2+x}\right)$
$4x^2+12x+60$
$\frac{dy}{dx}=\frac{ysen\left(\frac{y}{x}\right)+x}{xsen\left(\frac{y}{x}\right)}$
$\frac{dy}{dx}=\frac{x+y}{y-x}$
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