$x^2-2xy+y^2-16$
$\int\left(cos9x\right)dx$
$\left(-100\right)-\left(-50\right)+\left(+30\right)$
$\int x\log\left(x-1\right)dx$
$\lim_{x\to\infty}\left(1+\frac{-\sqrt{x}}{1+\sqrt{x+1}}\right)$
$416,98-216,75$
$z^2-5z-14$
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