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Find the angle between the line whose...

Find the angle between the line whose direction cosines are given by `l+m+n=0a n d2l^2+2m^2-n^2-0.`

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To find the angle between the lines whose direction cosines are given by the equations \( l + m + n = 0 \) and \( 2l^2 + 2m^2 - n^2 = 0 \), we can follow these steps: ### Step 1: Understand the given equations We have two equations involving the direction cosines \( l, m, n \): 1. \( l + m + n = 0 \) 2. \( 2l^2 + 2m^2 - n^2 = 0 \) ### Step 2: Express \( n \) in terms of \( l \) and \( m \) ...
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