If →a1 and →a2 are two non collinear unit vectors inclided at 60� – InterviewSolution

1.	If →a1 and →a2 are two non collinear unit vectors inclided at 60∘ to each other then the value of (→a1 - →a2) .(→2a1 + →a2 ) is
Answer» If ${\to a}_{1}$ and ${\to a}_{2}$ are two non collinear unit vectors inclided at $60^{\circ}$ to each other then the value of ( ${\to a}_{1}$ - ${\to a}_{2}$ ) .( $\to 2 a_{1}$ + ${\to a}_{2}$ ) is

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