$-2m-4n$

$\left(2+3m^2\right)^2$

$\left(3-x\right)\frac{dy}{dx}=2+y$

$x^2+3x-10-x^2+4x+21+x^2-2x+15-x^2-3x-2-7x+32$

$\left(\frac{2}{3}a^3b-\frac{4}{7}ab\right)\left(\frac{8}{5}ab-\frac{6}{5}a^2b\right)$

$\int_{\frac{\pi}{2}}^{\frac{\pi}{2}}\left(\sqrt{sin\left(x\right)}cos\left(x\right)\right)dx$

$\left(2x+y\right)\left(2x-y\right)=4x\left(x-1\right)$