JEE Main 2014Session, Shift 1MathematicsMediumThree Dimensional Geometry249× since 2002The angle between the lines whose direction cosines satisfy the equations l+m+n=0l+m+n=0l+m+n=0 and l2=m2+n2{l^2} = {m^2} + {n^2}l2=m2+n2 is :AOption A. π6{\pi \over 6}6πBOption B. π2{\pi \over 2}2πCOption C. π3{\pi \over 3}3πDOption D. π4{\pi \over 4}4πCheckSkip · show solution
