$\frac{\cos\left(3x\right)}{\cos\left(x\right)}$

$\lim_{x\to\infty}\frac{\ln\:\left(x\right)^3}{x^2}$

$\lim_{x\to\infty}\left(\frac{4x-10}{x-3}\right)$

$-12.5+3.5$

$\left(v+9\right)-\left(2v-1\right)$

$\frac{2}{10}x^4-\frac{1}{10}x^4-\frac{1}{10}x^4+\frac{3}{10}x^4$

$f\left(x\right)=\frac{1000}{5\cdot1245\cdot e^0}$