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1. Angle between lines from direction cosines ●●●○○ 50 ptsTwo lines have direction cosines $(l_1,m_1,n_1)$ and $(l_2,m_2,n_2)$. Each line satisfies $l+m+n=0$ and $\frac{mn}{q-r}+\frac{nl}{r-p}+\frac{lm}{p-q}=0$, where $p$, $q$, $r$ are distinct constants. Find the acute angle between the two lines, in degrees.