$z^2+2z+z$
$\lim_{x\to0}\:\frac{\left(\sqrt{1+x}-x\right)}{x}$
$\int\left(2x^2-5\right)^2\left(x-\frac{5}{4}\right)dx$
$\int\left(6\left(3x-7\right)^9\right)dx$
$5x^2+7x^2+8x^2+6x^2$
$2x^3y^2+\frac{y^4}{9}$
$\frac{dy}{dx}\left(\frac{t}{2t+1}\right)$
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