Balance tests

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• Organize information on the topic into subsections. for each subsection, include a brief description / overview, with links to articles that provide details

Subsection 1

$\phi _{n}(\kappa )={\frac {1}{4\pi ^{2}\kappa ^{2}}}\int _{0}^{\infty }{\frac {\sin(\kappa R)}{\kappa R}}{\frac {\partial }{\partial R}}\left[R^{2}{\frac {\partial D_{n}(R)}{\partial R}}\right]\,dR$

Subsection 3

$x={-b\pm {\sqrt {b^{2}-4ac}} \over 2a}$

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