the direction cosines of x axis are
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The x-axis makes angles 0°, 90° and 90° with x, y and z-axis. Again y-axis makes angles 90°, 0°, 90° with x, y and z-axis. ∴ direction cosines of y-axes are cos 90°, cos 0°, cos 90° i.e. 0, 1,0.
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