$\frac{x}{2}+3$
$15\le3-4m$
$\frac{cos\:a+tan\:a}{cos\:a\cdot tan\:a}$
$\lim_{x\to0}\left(\frac{1+x^4}{x^2}\right)$
$\sqrt{111.11}$
$-4+18-\left(-10\right)$
$\left(3x^2+7y^3\right)\left(9x^4-21x^2y^3+49y^6\right)$
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