$xm^3+xy+m^3-y$

$\lim_{x\to-\frac{\pi}{3}}\left(\frac{cos\left(x\right)-\frac{1}{2}}{x-\frac{\pi}{3}}\right)$

$2y^2-8y+8$

$3x^3+13x^2+13x+3$

$\lim_{x\to0}\left(\sin\left(7x\right)\cdot\cos\left(3x\right)\right)$

$-n+4\left(4n+1\right)$

$\:tan\:\left(x\right)=sec\:\left(x\right)-\frac{cos\left(x\right)}{sin\left(x\right)+1}$