If r is the position vector of the point (x, y, z) and A is a constant vector, show that:
(c) Also show that the result of part (a) is of the form Ax + By + Cz + D = 0 where D = -(A2 + B2 + C2 ), and that of part (b) is of the form x 2 + y 2 + z 2 = r 2 .
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