$\frac{x-2}{\left(x-1\right)\left(x^2+3\right)}$

$\left(\frac{x-0}{50-0}\right)\left(\frac{x-80}{50-80}\right)\left(\frac{x-90}{50-90}\right)\left(\frac{x-120}{50-120}\right)\left(\frac{x-150}{50-150}\right)$

$\lim_{x\to\infty}\frac{3x^2-8x}{3\left(x^3-4x^2\right)^{\frac{2}{3}}}-1$

$-5.8c+4.2-4.2-3.1+1.4c$

$\log\left(20\right)-\log\left(2\right)$

$\int\cos^5\left(9x\right)\sin\left(9x\right)dx$