$\lim_{x\to1}\left(2x^2+1\right)$
$\int_{-\infty\:\:}^0\:xe^{-2x}dx$
$3^2-2^3\left(7-9\right)+50$
$\csc\left(\frac{1}{3}x\right)-1$
$\lim_{x\to1}\frac{x^2-ax+a-1}{\left(x-1\right)^2}$
$y=a^4\left(a-x\right)^{-3}$
$\frac{18xy}{30x^6y^7}$
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