1.

Find theanglebetweentwo lineswhosedirection ratiosare "(i) 2,1,2 and4,8,1""""(ii) 5 ,-12 ,13 and -3,4,5" "(iii) 1 ,1,2 and" (sqrt(3)-1) ,(-sqrt(3)-1),4 """(iv)a,b,c and(b-c) ,(c-a),(a-b)"

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Answer :`cos^(-1) ((2)/(3))(ii) cos^(-1) ((1)/(65)) (III) (pi)/(3) (iv)(pi)/(2) `


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