$\int x\infty e^{-2x}dx$

$\left(2x^3y\right)dx+\left(x^4+y^4\right)dy=0$

$\left(x^{a+1}-3\right)\left(x^{a+1}+2\right)$

$\left(x^6+10y^2\right)^2$

$\frac{3}{1}x\frac{1}{2}+\frac{\left(\frac{1}{3}+\frac{1}{2}\right)}{\left(\frac{2}{1}+\frac{1}{8}\right)}+\frac{1}{3}x\frac{1}{4}$

$7-x-\left[2x+3+\left(x+2\right)\right]+5x$

$y=\frac{9x^9sinx}{4\sqrt{secx}}$