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ISRO 2013- Angle between vectors [Mech]

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Angle between $2$ vectors is given by :-

$Cos \ \alpha = \frac{ {\displaystyle {\vec {a}}}. {\displaystyle {\vec {b}}}}{|| {\displaystyle {\vec {a}}}||.|| {\displaystyle {\vec {b}}}||}$

$Cos \ \alpha = 0 \Rightarrow \alpha = 90$
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