There is a three-dimensional sphere with coordinates in the Cartesian plane. It is necessary to obtain the equation of this sphere in the system of spherical coordinates.
Closed due to the fact that the issue is too common for participants Harry , Vlad from Moscow , Kromster , Abyx , user194374 22 Dec '16 at 6:09 .
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R = 1(8 characters needed ...) - Igorj) varies from -90 to 90 degrees. - Igor