$2\left(x+1\right)\left(x-14\right)$

$\left(5b^3-2a^3-6\right)-\left(8+2b^3-5a^3\right)$

$\lim_{x\to2}\left(\frac{x^2+8x+12}{x^2+2x}\right)$

$2g-6g$

$\frac{e^x}{c+e^x}=e^{x-\ln\left(c+e^x\right)}$

$\frac{2\left(1-2\cos^2\left(x\right)\right)}{\sin\left(2x\right)}=\frac{-2+\left(\frac{1}{\cos\left(x\right)}\right)^2}{\frac{\sin\left(x\right)}{\cos\left(x\right)}}$

$\frac{1}{x+h-1}-\frac{1}{x-1}$