$1-cos8\theta\:\:=2sin^24\theta\:\:$
$\frac{2^i}{3^{i+1}}x^i$
$\frac{2^3\cdot5^4\cdot2^{-1}\cdot5^2}{5^3\cdot2^{-2}\cdot5^3\cdot2^4}$
$cscx=-3$
$\int e^{-3x}db$
$17-\left(11+3\right)$
$y^2-9+20$
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