$\frac{\cos\left(\infty\right)+\tan\left(\infty\right)}{\cos\left(\infty\right)\cdot\tan\left(\infty\right)}=\cot\left(\infty\right)+\sec\left(\infty\right)$

$\frac{d^2}{dx^2}\left(5-\frac{8}{x}\right)$

$x^2+8x+9=0$

$\int x.e^{-5x}dx$

$\lim_{x\to0}\left(\frac{x-3-\sqrt{5}}{x}\right)$

$\int\left(10x^4\right)lnxdx$

$12p^2+3pq$