$b^44-\frac{2}{25}a^2b^2$
$\left(mn-y\right)^5$
$\sin2x=2\sin^2x$
$\lim_{x\to0}\left(\frac{e^x}{8^x}\right)$
$\int\left(3x^2+4x\right)ln\left(x+2\right)dx$
$\frac{x^2+7x+7}{3x+3}$
$x^2-3x+4\ge0$
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