If direction ratios of two lines are \[5,\,\,-12,\,13\] and \[-3,\,4,\,5\] then the angle between them is [RPET 2001]

If direction ratios of two lines are \[5,\,\,-12,\,13\] and \[-3,\,4,\

1.	If direction ratios of two lines are \[5,\,\,-12,\,13\] and \[-3,\,4,\,5\] then the angle between them is [RPET 2001]
A.	\[{{\cos }^{-1}}(1/65)\]
B.	\[{{\cos }^{-1}}(2/65)\]
C.	\[{{\cos }^{-1}}(3/65)\]
D.	\[\pi /2\]
Answer» B. \[{{\cos }^{-1}}(2/65)\]

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If direction ratios of two lines are \[5,\,\,-12,\,13\] and \[-3,\,4,\,5\] then the angle between them is [RPET 2001]

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