Let $\alpha$ 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 $\sin ^4 \alpha+\cos ^4 \alpha$ is: [JEE Main 2021, 25 Feb (Shift 1)]

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Let \(\alpha\) be the angle between the lines whose direction cosines satisfy the equations \(l+m-n=0\) and \(l^2+m^2-n^…

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