$4^4\cdot4^2\cdot4^7$

$\int x\cdot sin\left(kx\right)dx$

$b-\left(5+6-3+6\right)+3-\left(+5-2+1\right)$

$\int\frac{x^2+4}{x^3-x}dx$

$\frac{dy}{dx}=\frac{\sqrt{y}}{x^2-x-2}$

$\left(+31\right)\:x\:\left(\:-46\right)$

$\ln\left(x+2\right)+\ln\left(3x-12\right)=\ln\left(2x-2\right)+\ln x$