$\left(x+6\right)\left(2x+5\right)$
$64f^2+160f+100$
$6x^{6-1}$
$x^2-4x-3$
$\frac{a^2}{4}-\:\frac{b^4}{9}$
$\lim_{x\to49}\left(\frac{\left(x-49\right)}{\left(\sqrt{x}-7\right)}\right)$
$75.9+23.01$
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