$-x^2-4x+6=0$
$\lim_{x\to-1}\left(\frac{x^4+5x^3+6x+10}{x+1}\right)$
$5x+\left(3x-2\right)\le4\left(2x+3\right)$
$y\left(x\right)=a\left(1+x^2y'\right)+xy$
$\sin1-x^{-2}$
$\frac{x^{-3}}{x^{-8}}$
$\int tan\left(2x\right)\sqrt{sec\left(2x\right)}dx$
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