$\frac{d^2}{dx^2}\left(a\cdot b\right)$

$\int_5^{\infty}\left(\frac{1}{\sqrt{x^2-25}}\right)dx$

$\frac{\left(sec\left(x\right)-cos\left(x\right)\right)}{cos\left(x\right)}=\left(tan\left(x\right)\right)^2$

$\left(2u^2\right)^9\left(2u\right)^5$

$\int_{-1}^1\left(\frac{x}{\sqrt{4x^4}\:-10}\right)dx$

$\csc\left(b\right)\sin\left(2b\right)$

$\lim_{x\to0}-\left(x\sqrt{7+x^{-2}}\right)$