Let \alpha^{\to},\beta^{\to},\gamma^{\to} be three unit vectors such that \alpha^{\to}.\beta^{\to} = \alpha^{\to}.\gamma^{\to} and the angle between \beta^{\to} and \gamma^{\to} is 30°. Then \alpha^{\to} is

Correct Answer is : ±2(→β×→γ)

2(\beta^{\to}\times\gamma^{\to})

-2(\beta^{\to}\times\gamma^{\to})

\pm2(\beta^{\to}\times\gamma^{\to})

(\beta^{\to}\times\gamma^{\to})

WBJEE 2018 Math Solved Paper

Question : 59 of 75

Marks: +1, -0

Let

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be three unit vectors such that

→

and the angle between

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and

→

is 30°. Then

→

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