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The full song name is \frac{1}{2\cdot \:1}\cdot \int _{-1}^1\left(1-x^2\right)dx+\sum _{n=1}^{\infty \:}\frac{1}{1}\cdot \int _{-1}^1\left(1-x^2\right)\cos \left(\frac{n\pi x}{1}\right)dx\cdot \cos \left(\frac{n\pi x}{1}\right)+\sum _{n=1}^{\infty \:}\frac{1}{1}\cdot \int _{-1}^1\left(1-x^2\right)\s...