$4-2b=-2b+4$
$\frac{1}{3}^3\:+2\:y^3-\frac{2}{5}^2y+3$
$\lim_{x\to0}x^{9x}$
$\frac{4xy^2}{12x^3y}$
$2x^2-x+4$
$\lim_{x\to0}\left(\frac{sin^2x}{tan^2x}\right)$
$\int\left(4x^3-3\right)\:\ln\left(x\right)dx$
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