If a line makes the angles \( \alpha, \beta, \gamma \) with \( 3 \mathrm{D} \) coordinate axis t....

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If a line makes the angles \( \alpha, \beta, \gamma \) with \( 3 \mathrm{D} \) coordinate
\( \mathrm{P} \)
axis then the value of \( \cos 2 \alpha+\cos 2 \beta+\cos 2 \gamma \) is ' \( a \) '
W
then \( |a| \) is


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