$\frac{5-z^{x}9}{521-9^{x}912}$
$\int^5-2\left(x+4\right)dx$
$4sin^2x+2cos^2x=3$
$\int x\left(7-4x^2\right)^3dx$
$\lim_{x\to100}\left(\frac{100-x}{\sqrt{x}-10}\right)$
$\left(5+m+n\right)\left(5-m-n\right)$
$\left(2x-\:4y\right)^3$
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