$\left(3m+4d\right)\left(3m-4d\right)$

$\left(2x-4\right)\left(3x-1\right)=\left(x-4\right)\left(x-3\right)-4-6x^2$

$\lim_{x\to1}\left(\frac{x^2+x-2}{x^2+4x+4}\right)$

$\frac{22\left(sen45\right)}{sen35}$

$\frac{dy}{dx}\left(\tan\left(xy\right)-\sin\left(x-y\right)=x-2y\right)$

$\frac{dy}{dx}=8x\cdot\left(y+4\right)^2$

$5^3\cdot10^3$