$\int\:\:cos^2\:\frac{x}{2}\:dx$
$\left(-a^m\right)\left(2ab\right)\left(-3a^2b^2\right)$
$\frac{125-343x^{15}}{25-84x^5}$
$8x^2y^2-6x^27^2$
$1,8+5,4$
$\lim_{x\to\infty}\left(\frac{1+2x}{x}\right)$
$\frac{3}{4}x-7b=8$
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