$\left(-10\right)+5+176$
$+27+\left(-6\right)-\left(-5\right)+8$
$\frac{3x+47}{\left(x-3\right)\left(x+4\right)}$
$\frac{\cos\left(5x\right)-\cos\left(9x\right)}{\cos\left(5x\right)+\cos\left(9x\right)}$
$\frac{\left(s^2-2st+t^2\right)}{s-t};s=6;t=7$
$\int\frac{3r-1}{r^{2}-r}dr$
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