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Question

If A(3,4,5),B(4,6,3),C(1,2,4) and D(1,0,5) are such that the angle between the lines ¯¯¯¯¯¯¯¯¯DC and ¯¯¯¯¯¯¯¯AB is θ then cosθ=

A
79
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B
29
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C
49
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D
59
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