$\cos^2=-0.9$
$x+3x-2$
$\sqrt[3]{48a^3}$
$\int\sin\left(11x\right)\cdot\cos\left(7x\right)dx$
$\lim_{x\to0}\left(\frac{e^x}{5x^4}\right)$
$7,5x+4y=3$
$\:5\left(2n\:+\:3\right)\:+\:4n\:$
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