55. The sum of the direction cosines of Z-axis is
2013
(b) 1/3 (c) 1
(a)
(d) 3
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Direction cosines of z-axis, assuming a three dimensional Cartesian coordinate system: (0, 0, 1). Meaning that the cosine of the angle between:
the z-axis and the X-axis is 0 (90 degrees);
the z-axis and the Y-axis is 0 (90 degrees );
the z-axis and the z-axis is 1 ( 0 degrees).
Did you have another coordinate system in mind?
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