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Coordinate Systems: 3D

(Note: there are two spherical coordinate system conventions. The one used here is that the angle is on the plane z=0, measured clockwise from the x-axis. The angle is the angle relative to the z-axis.)

Variant #: 9

In cartesian coordinates x = -30.89, y = -15.87 and z = 28.03. What is the angle ?

o.?

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