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Dear student,
Use the following . = | | × | |cosθ
cos theta = L1L2+M1M2+N1N1 DIVIDED BY WHOLE ROOT OVER[ (LI^2+M1^2+N1^2)(L2^2+M2^2+N2^2) ]...WHERE L1,M1,N1 AND L2,M2,N2 ARE THE DIRECTION COSINES OF THE 2 GIVEN LINES ...PLEASE APPROVE MY ANSWER
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