$6.4\cdot1.2-6.28$
$\lim_{x\to1}\left(\frac{sin^20-x}{x}\right)$
$\int\:\left(\frac{x}{7}\right)dx$
$4a^2-7;a=2$
$43+52-6$
$\sqrt[3]{\frac{325.12}{\pi\frac{4}{3}}}$
$\left(\frac{1}{4}m+n\right)\left(-\frac{1}{4}m+n\right)$
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