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

$\int\left(x^2+1\right)e^{-2x+4}\:dx$

$33xy+12yx-15xy-33yx$

$\left|\left(-5\right)-\left(-15\right)\right|:\left|\left(+6\right)-\left(+8\right)\right|$

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

$\left(9a\right)^{-1}$

$\frac{d^2}{dx^2}\left(e^{x+y}\right)$