$7\left(x-4\right)-3\left(x+5\right)$
$\left(-80\right):\left(-10\right)$
$u^6-2u^3+1$
$\int_1^{+\infty}\left(1\cdot\:ln\:x\right)dx$
$\frac{6x+2}{3x-1}\le5$
$\cot\left(\arccos\sqrt{\frac{3}{7}}\right)$
$\frac{6x^4+23x^2+4x+15}{x^2+3}$
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