$18m^4n^2n^6m^8$

$\lim_{x\to1}\left(\frac{\left(5x+2\right)}{x^2-1}\right)$

$\lim_{h\to0}\left(\frac{\left(x+h\right)^2-x^2}{h}\right)$

$6a^2b^2-15a^2b$

$\frac{x-3}{x^4-1}$

$\sin\left(w\right)\tan\left(w\right)=\sec\left(w\right)-\cos\left(w\right)$

$\int\left(\frac{1}{\sqrt{9x^2+36x+37}}\right)dx$