$\int_{\sqrt{2}}^3\left(x^3\cdot\sqrt{x^2+7}\right)dx$

$\lim_{x\to0}\left(\frac{x^3-x^2}{1+x-e^x}\right)$

$\left(\frac{a}{2}-\frac{b}{4}\right)\left(\frac{a}{2}+\frac{b}{4}\right)$

$3\left(2n\right)$

$\int\frac{1}{3x\left(x+1\right)}dx$

$3^6+3^5$

$9b^2-30c^2b+25c^4$