$5.8c+4.2-3.1+1.4c$

$52mn-36+28mn^3$

$\frac{d}{dx}\left(\frac{\left(x^2+1\right)^4.\left(e^{5x}\right)}{\left(\sin\left(x\right)\right).\left(\sqrt{3}\right)}\right)$

$\int_0^9cos\left(\pi x\right)dx$

$\frac{x^6-30x-5}{x-2}$

$x^2-x-90$