$\frac{\int3\sec\left(x\right)}{\tan^2\left(x\right)}dx$

$\int\frac{1-2\cos\left(x\right)^2+\cos\left(x\right)^4}{\cos\left(x\right)^6}dx$

$\frac{\left(6x^3y^{-4}\right)^{-2}}{\left(3x^2y^5\right)^{-3}}$

$\int\frac{54}{x^4-2x^3-3x^2+4x+4}dx$

$\lim_{x,y\to-2,3}\left(\frac{e^{2y}\sin\left(3x\right)}{3x+2y}\right)$

$3x^2-8x-3$

$\lim_{x\to\infty}\left(\frac{\ln\left(x\right)}{\frac{x}{log\left(x\right)}}\right)$