$-8a+4b-6a+81b-114b+81a-a-b$
$yd=0$
$-\frac{1+\sqrt{3}}{2}=-1+\frac{1-\sqrt{3}}{2}$
$\int\pi^{3t}5dt$
$\lim_{x\to0}\left(\frac{\sqrt{4-x^2}}{x}-2\right)$
$-100-773$
$7-5\cdot\left(4-6\right)$
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