MathematicsMedium249×since 2002Q2378Let α\alphaα be the angle between the lines whose direction cosines satisfy the equations l + m −-− n = 0 and l² + m² −-− n² = 0. Then the value of sin⁴α\alphaα + cos⁴α\alphaα is :A38{{3 \over 8}}83B34{{3 \over 4}}43C12{{1 \over 2}}21D58{{5 \over 8}}85Check answerSkip