1.

If l_(1), m_(1), n_(1) and l_(2), m_(2), n_(2) are the direction cosines of two vectors and theta is the angle between them, then the value of cos theta is

Answer»

`SIN theta=l_(1)-l_(2)`
`cos theta=(l_(1)-l_(2))/(2)`
`sin theta =sqrt(2)(l_(1)-l_(2))`
`cos theta=((l_(1)+l_(2)))/(sqrt(2))`

Answer :D


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