$25+32+4$
$0,5x^2-60x+600>0$
$\frac{1}{\cos\left(2x\right)}$
$\int\:\frac{\sqrt{x^2-121}}{x}dx$
$\frac{20a^2b^2}{-10a^5b}$
$\left(2x+10\right)\left(x-5\right)$
$\left(a+2\cdot b\right)^2-\left(a-2\cdot b\right)^2$
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