$\lim_{x\to\frac{\pi}{2}}\left(9tanx^{9cosx}\right)$
$\frac{1}{4}\cdot\frac{1}{1+\left(\frac{2x^2+1}{2}\right)^2}$
$\left(x^4-3x^2+x+1\right)$
$4^8\cdot4^{-10}$
$12.90+33$
$16g^2-9$
$\frac{dy}{dx}=\frac{e^x-e^{-x}}{e^y+e^{-y}}$
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