$\frac{3\:sen\left(x\right)+\:4\:cos\left(x\right)}{sen\left(x\right)\:cos\left(x\right)}=3\:sec\left(x\right)\:+4\:csc\left(x\right)$

$\frac{9a}{3a^3}^4$

$-5\cdot2-12$

$\frac{2xy-x^2}{x^4}$

$\left(8x^3\right)^2$

$\int_x^{-x}sec^3t\:dt$

$\lim_{x\to\infty}\left(\frac{ln\left(x^{12}\right)}{4x}\right)$