$\frac{5x^3-2x+1}{x+1}$

$\lim_{x\to-1}\left(\frac{5x^4-5x^2}{3x^4-17}\right)$

$2187\cdot3$

$\lim_{n\to\infty}\left(\frac{\left(n+1\right)\left(ln\left(n+1\right)\right)^4}{n\left(ln\left(n\right)\right)^4}\right)$

$-a+b-c+8+2a+2b-5-2c-3a-3$

$\cos\left(21\right)\cos\left(59\right)-\sin\left(21\right)\cos\left(59\right)$

$23.56-19.91$