$8m^2+5+-2+7m^2$
$\frac{csc\left(x\right)}{2cos\left(x\right)}$
$25x^2-30x+225$
$\lim_{x\to4}\left(\frac{\sqrt{x^3}-8}{x^{\frac{1}{2}}-2}\right)$
$\left(a+0\right)\left(a-6\right)$
$x:4-28$
$\left(3x^2+4xy\right)^2$
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