$\left(+10\right)\cdot\left(-11\right)\cdot\left(-12\right)\cdot\left(+13\right)$
$ln\:\left(\frac{\left(3-x\right)}{\left(3+x\right)}\right)$
$\sqrt{5x^2}\sqrt{40x}$
$3a+9^2$
$10y^2-20y-20$
$42x-4-5x-10+x^3-22x^2+5x+8$
$\int\frac{2x^3-2x+1}{x^2-x}dx$
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