$\left(-2+\sqrt{x}\right).\left(+2+\sqrt{x}\right)$
$\int_0^{1000\:}\left(e^{-2k\left(x+y\right)}\right)dx$
$\left(4x+z\right)^2$
$\int_0^{2\pi}\left(-\cos^3x\sin x\right)dx$
$\int\frac{x-4}{x^2-49}dx$
$\left(\frac{x^{11}y}{-2z^4}\right)^5$
$\left(3m^3-n\right)^2$
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