How can I make graphic, int the maple, this equation: $\displaystyle u(x,t) = \sum_{n=1}^{\infty} \frac{2}{L} [\int_0^L e^{-x} sin(\frac{2n-1}{2L} \pi x)] sin(\frac{2n-1}{2L} \pi x) e^{-[\frac{2n-1}{2L} \pi]^2 \alpha^2 t}$
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