MathematicsMedium249×since 2002Q2379The angle between the straight lines, whose direction cosines are given by the equations 2l + 2m −-− n = 0 and mn + nl + lm = 0, is :Aπ2{\pi \over 2}2πBπ−cos−1(49)\pi - {\cos ^{ - 1}}\left( {{4 \over 9}} \right)π−cos−1(94)Ccos−1(89){\cos ^{ - 1}}\left( {{8 \over 9}} \right)cos−1(98)Dπ3{\pi \over 3}3πCheck answerSkip