$\left(9^{-n}\cdot9\right)^3$

$\cos\left(x\right)=\frac{4\sqrt{17}}{17}$

$\int-3x\cdot\sin\left(8x\right)dx$

$\int9tan\left(x\right)sec^2\left(x\right)dx$

$\frac{d}{dx}\left(y=\frac{\left(8x-5\right)}{\left(6x-3\right)}\right)$

$x^2+10x+20=5$

$\left(10\:+\:5ab\right)\left(10\:-\:5ab\right)\:$