$\int\frac{ex^2}{\left(x+1\right)^2}dx$

$\lim_{x\to3}\left(\frac{x^2-9}{4-\sqrt{x^2+7}}\right)$

$\int_{\frac{\pi}{4}}^{\frac{\pi}{3}}\frac{-sinx}{cos^2x}dx$

$\int\left(x+2\right)^2ln\left(x\right)dx$

$\left(\frac{7}{9}a^5b+\frac{2}{3}\right)\left(\frac{7}{9}a^5b-\frac{2}{3}\right)$

$1.000-407.01$

$\lim_{x\to\infty}\left(\csc\left(\frac{1}{x}\right)^{\frac{1}{8^x}}\right)$