$\int b^2e^{-13b}db$

$16x^2-32x+36$

$\lim_{x\to\frac{2\pi}{3}}\left(\frac{tan\left(x\right)+\sqrt{3}}{2cos\left(x\right)+1}\right)$

$\int sen\:\left(2-7x\right)\:dx$

$\frac{3}{x}\:-\:\frac{2}{y}\:=\:0$

$\left(-4\right)x\left(+2\right)x\left(+3\right)$

$\frac{d}{dx}\left(\frac{\sqrt[4]{x}}{x^3}\right)$