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The angle between the lines whose direction cosines are $\bigg(\large\frac{\sqrt 3}{4},\frac{1}{4},\frac{\sqrt 3}{2}\bigg)$ and $ \bigg(\large\frac{\sqrt 3}{4},\frac{1}{4},\frac{-\sqrt 3}{2} \bigg)$ is

\[\begin {array} {1 1} (1)\;\pi & \quad (2)\;\frac{\pi}{2} \\ (3)\;\pi/3 & \quad (4)\; \pi/4 \end {array}\]

1 Answer

$ (3)\;\pi/3$
answered Nov 7, 2013 by pady_1
 
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