$x^2-5x+8$
$\left(m-n\right)^7$
$\lim_{x\to7}\left(\frac{x^2-49}{x^2-7x}\right)$
$2b^2+3b+15b^3+b^2+3$
$\frac{\cot\left(\infty\right)}{\tan\left(\infty\right)}=\cot^2\left(\infty\right)$
$3+-2\left(-z+9\right)$
$\int_0^{\infty}x^2.e^{-\frac{x^3}{3}}dx$
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