spherical coordinates part II, Infinitesimal displacement, Infinitesimal volume, infinitesimal area

Infinitesimal displacement in spherical coordinates, Infinitesimal volume in spherical coordinates, an infinitesimal area in spherical coordinates are explained here.
Griffith electrodynamics 4th edition, pure physics

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[@halifali4278]

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Voice is not clear

[@martinkjelberg1031]

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[@purephysicstu]

yes, sure