$\int\left(x^3\sqrt{x^2+43}\right)dx$
$\left(m^{-6}n^8\right)^{-2}$
$-55gn^2n^3x+110m^2n^3x^2$
$2\sec\left(\frac{\pi}{5}\right)-\frac{2}{3}\cos\left(\frac{\pi}{8}\right)$
$x^2+14x\le0$
$3x<2-9x$
$\sin\left(x\right)=-0.6562$
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