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 line \stackrel{-}{DC} and \stackrel{-}{AB} is θ then \cos \theta=

AP EAMCET Engineering 2014 Code A Solved Paper

Question : 61 of 160

Marks: +1, -0

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 line

−

and

−

is θ then cos θ=

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