$\frac{cos\left(x\right)^2}{sin\:\left(x\right)^2}$

$\lim_{x\to\infty}\left(x-\ln\left(e^x+x-1\right)\right)$

$\int7x\cdot e^{9x}dx$

$\int\frac{x^2}{\left(5x+7\right)^3}dx$

$\sqrt{s^2}t^2p$

$\int_0^{\frac{\pi}{3}}\left(\tan^6x.\sec^6x\right)dx$