$3m^2-6m+4m-8n$

$\left(\frac{4}{7}-5x^2\right)\left(\frac{4}{7}+5x^2\right)$

$\frac{du}{dt}=\sqrt{\frac{3u-2}{2t+1}}$

$3h+15,\:si\:h=1$

$\frac{dy}{dx}=\frac{3}{x+3};y\left(0\right)=3$

$\left(-31\right)\cdot\left(-9\right)$

$\frac{x-\sqrt{17x^2-8x+1}}{16x^2-1-x+16x^3}$