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The direction cosines of the lines L(1),...

The direction cosines of the lines `L_(1),L_(2)` are respectively proportional to (1,-2,-2) and (0,2,1) if (a,b,c) are the direction cosines of a line perpendicular to both `L_(1)`and `L_(2)` then the value of `3a^(2)-4b^(2)+5c^(2)` is
1) `7/9` 2)`13/9` 3) `28/9` 4) `26/9`

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