$\left(-19+25-31\right)\cdot\left(-5-8\right)$
$\lim_{t\to0}\left(\frac{te^2}{1-e^t}\right)$
$3x^3y-9x^3y+11x^3y$
$\sin\left(x+b\right)+\sin\left(x-b\right)=2\sin\left(x\right)\cos\left(b\right)$
$18x^2-45x-8$
$y'-e^{x+y}=0$
$\frac{x^4-2x^3+8x-15}{x+1}$
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