How do I get bigger brackets. I want the small brackets here to be much bigger and cover the entire thing, as in they should stay where they are but be taller:

$\displaystyle (\sqrt[1^0]{\frac{{\sqrt{\frac{198(99^3(99^{-1}))}{99}}}}{\sqrt {2}}})^{sin90\cdot^{cos90\cdot^{tan45\cdot}}}$

Whilst I'm here, how do you get logx n

so like log2 32 ....which would be 5?