$\lim_{x\to0}\left(\frac{sin\left(x\right)}{\sqrt{\frac{1-x}{x}}}\right)$
$4^{-8}\cdot4^5$
$\frac{d}{dx}6^x$
$12x^3-16x^6$
$\left(2x+5\right)\left(2x-9\right)$
$\frac{+40}{-8}+5$
$\frac{1}{\cot x+\csc x}=1-\frac{\cos x}{\sin x}$
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