$$\left(\frac{\left(3j^{-3}k^6\right)^4}{j^{-2}k^{-8}}\right)^{\frac{1}{2}}$$

$$\left(3m\:+\:4\right)\left(3m\:-\:4\right)$$

$$125 h ^ { 9 } + k ^ { 12 }$$

$$\int cos\:\left(ln5x\right)dx$$

$$1-\cos^4\left(a\right)-\frac{1}{4}\sin^2\left(2a\right)+\cos\left(2a\right)$$

$$n^2+11n$$

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