$\left(2x+y-2\right)\left(2x-y+2\right)$
$a^4-12a^2+36$
$\int\left(\frac{y-\sqrt{1+y^2}}{1+y^2}\right)dy$
$98.15\cdot7.264$
$y'=u\left(x\right)x^2$
$\int\:\sqrt{u^2-1}du$
$x+3>x-4$
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