$\int\left(\frac{\sqrt{x}-1}{\sqrt{x}\:+1}\right)dx$
$2\cos ec38.2^{\circ}+\cos3\left(146.4^{\circ}\right)$
$4\left(x+1\right)+7\left(x+3\right)$
$\left(2ab^3\right)^7$
$8x^2+3x-5x^2+7x-9x^3-5x^2$
$\left(3m-7\right)\left(3m+2o\right)$
$\left(x^2-1\right)\left(\sqrt[3]{x}+1\right)$
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