$x^2-36\left(x+6\right)\left(x-6\right)$
$-.001x^2+0.25x$
$\lim_{x\to0}\left(\frac{2cosx\:-+x^2}{x^2\sin x}\right)$
$4a^2-20a+25$
$16+9\left(x+2\right)^2$
$10x-10-6\left(x+2\right)$
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