$\lim_{x\to1}\left(\frac{sqrt\left(2+x\right)-sqrt\left(4-x\right)}{x-1}\right)$
$\int\cos\left(3z+4\right)dx$
$19\ln\left(a\right)$
$3\sqrt[7]{x^2}$
$\frac{2}{3}x-9-2x+2-3x$
$p^2+p-1$
$\left(7x^2+9x+3\right)+\left(5x^2-2x+1\right)$
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