Let α be the angle between the lines whose direction cosines satisfy – InterviewSolution

1.	Let α 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+cos4α is :
Answer» Let $α$ be the angle between the lines whose direction cosines satisfy the equations $l + m - n = 0$ and $l^{2} + m^{2} - n^{2} = 0$ . Then the value of ${sin}^{4} α + {cos}^{4} α$ is :

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