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For example we are given two vectors A(2,-2, 1) and B(1,2,-2). They are in different systems A is in spherical and B in in cylindrical and I don't have a problem handling that. Now what does it mean when it says: if they are perpendicular at spherical coordinate point P(2, theta, 60 deg) find theta. Now I know dot product is zero when they are perpendicular. I have no idea how how this has anything to do with theta as what does it mean when it says at point P?