$-\sqrt{0.64}$
$y^2+6y+9=0$
$-2\left(5+3-\left(2+4\left(5+6\right)-3-5\right)\right)$
$\lim_{x\to2}\left(\frac{-x}{\left(x-2\right)^2}\right)$
$2sin^2x-1=cos2x$
$\lim_{x\to1}\left(\frac{1}{1-x}-\frac{1}{lnx}\right)$
$\frac{a}{4}^4-a^2b+b^2$
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