$\left(5+6\right)-\left(9+4\right)-\left(-5+6-1+7-5-2+3\right)$

$1+2+3+4+5-6$

$\int_{-2}^{-1}\frac{4x^2+7x+4}{x^3+2x^2+2x}dx$

$\left(6\cdot c+5\cdot n\right)^2$

$\left(2x+1\right)\frac{dy}{dx}=4xy$

$ax\left(bx+ay\right)+by\left(ay+bx\right)$

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