$x^2-2xy+y^2\cdot xy-x^2+3y^2$
$cos3x\:=\:-1$
$6p\:27\:\left(p\left(r+s\right)+p\:2\:+rs\right)$
$\left(2x^2\right)\left(2x^3-3x^2+4x\right)$
$7<5-x$
$\lim_{x\to5}\frac{30x^2+105x+75}{15x^2+15x}$
$10x^3+6x^2-2x-6$
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