$\int\left(3\frac{3}{\sqrt{x}}\right)\:dx$

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

$\int_1^2\frac{2x^2-3x+2}{x^3+x}dx$

$x^2+y^2-2ax=0$

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

$\lim_{x\to3}\left(\frac{2x^2-5x-3}{x-3}\right)$

$\int\tan^4\left(2t\right)dt$