$7.7\cdot17$
$\:\left(1+b\right)^2$
$4.0\times10^{6}$
$\frac{4}{a}-\frac{3}{3a+2}-\:\frac{2}{\left(3a+2\right)}$
$y=\ln\left(x\sqrt{x^2}-1\right)$
$\frac{d^2}{dx^2}\left(e^x-x\right)$
$y=-\frac{1}{3}x-3$
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