$\frac{9}{25}a^2\frac{49}{36}b^2$
$16b^2-81=0$
$x\left(x-1\right)-x-3x^2$
$\sqrt{8\cdot a^2\cdot4\cdot b^2}$
$500x^{15}+108x^9$
$\int\frac{1-\sen\theta}{\theta+\cos\theta}d\theta$
$56.1-3,261+43.6$
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