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  "body": "\n## Summary\n\nSpherical coordinates describe a point of space by three numbers. They are its distance from the origin, the angle between its position vector and the positive $z$-axis, and an azimuth angle around the $z$-axis.\nThey simplify problems with symmetry about a point, such as integrals over balls.\n\n## Remarks\n\nThe names and the order of the two angles differ between mathematics and physics texts. Each text must state its convention.\n",
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