$14ab-28a^2b^2$
$w^2+100-25w$
$f\left(x\right)=\left(2x-5\right)\left(-3x+4\right)\:$
$x^2-10x+25>\:0$
$\tan\left(5-\sin2x\right)$
$6cosx-7sin^2x+6$
$\lim_{x\to\infty}\left(\frac{x-1}{\sqrt{x^2-1}}\right)$
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