$\frac{d^4}{dx^4}\left(x^4-4x^3\right)$

$\lim_{x\to5}\left(\frac{2x^2+16x+30}{x+5}\right)$

$-16\:-\:\left[-13\:-\:\left(25\:-\:37\right)\:+\:\left(34\:+\:32\right)\right]\:-\:\left[-26\:-\:\left(45\:-57\right)\right]\:\:$

$\left(3x^3+5-6y\right)\left(y^2\right)$

$\lim_{x\to0}\left(\frac{\left(e^x-\left(1+x\right)\right)}{x}\right)$

$-7^2-28e-28$

$2x^3-15x^2+33x-20$