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[" Find the angle between the two straig...

[" Find the angle between the two straight lines whose direction cosines "ell,m,n" are given by "],[2ell+2m-n=0" and "mn+n ell+ell m=0]

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The angle between the straight lines, whose direction cosines are given by the equations 2l+2m -n=0 and mn+nl+lm=0 , is :