Find the angle between the lines whose direction cosines are given by the equations: l+2m+3n=0 and 3lm-4ln+mn=0

Find the angle between the lines whose direction cosines are given by the equations: $l + 2 m + 3 n = 0$ and $3 l m - 4 \ln + m n = 0$

Matching exercise

Match the items on the right to the items on the left.

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