$11r\:-\:12r$
$\left(d+1\right)\left(5-d\right)$
$\left(x-1\right)dx+\left(y+1\right)dy=0$
$x^2+x-2\left(x+1\right)$
$4\cdot\left(-3\right)-\left(\left(-1\right)^2-4\right)^2$
$\lim_{x\to0}\left(1+2\sqrt{x}\right)$
$\frac{dx}{dy}=x^2+2x+2$
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