$\frac{1}{-\cos^2\left(x\right)}=2$
$+2x-14x-13x+14x-25x+17$
$4x^{2}+3xy=11$
$-8.3-85.4$
$x^2+12x-45\le\:4$
$abcx^2-abcdx=0$
$\int\left(\frac{xarctgx}{\sqrt{1+x^2}}\right)dx$
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