If a-b- and c- are three unit vector a- is perpendicular to b- and c- and angle between b- and c-b is 30 - prove that a- - - 2 b-c-

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Dot Product of Two Vectors

if a⃗,b⃗ and...

Question

if $\to a, \to b$ and $\to c$ are three unit vector $\to a$ is perpendicular to $\to b$ and $\to c$ and angle between $\to b$ and $\to c$ b is $30^{\circ},$ prove that $\to a = \pm 2 (\to b \times \to c) .$

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