$\lim_{x\to0}\left(\frac{x^2+3x+3}{x}\right)$
$-1=4-x$
$\int\frac{1}{2x^2+5}dx$
$\csc\left(a\right)=\sec\left(90-a\right)$
$9bx8b$
$w2+2w-3$
$\left(4x^2-3y^4\right)\left(5x^2+7y^4\right)$
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