dtree2

\frac{w+a}{d+3}=\frac{r}{t}

\frac{w+a}{d+3}=\frac{r}{t}
        = \frac{\partial y}{\partial x}

\int_{0}^{1}\frac{x^{4}\left(1-x\right)^{4}}{1+x^{2}}dx
=\frac{22}{7}-\pi

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