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## Main Question or Discussion Point

While deriving the volume of sphere formula, I noticed that almost everyone substitute the limits 0 to 360 for the angle (theta) i.e the angle between the positive x axis and the projection of the radius on the xy plane.Why not 0to 360 for the angle fi (angle between the positive z axis and radius)?

I tried it, but I got 0 as answer.Please explain this.

I tried it, but I got 0 as answer.Please explain this.