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Angle between Two Lines

The angle bet...

Question

The angle between the vectors $\to a =^i +^j -^k a n d \to b =^i +^j +^k$ is

A

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B

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C

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D

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Solution

The correct option is B

$c o s^{- 1} ⎛ ⎜ ⎝ \frac{\to a . \to b}{∣ ∣ ∣ \to a | | \to b |)} ⎞ ⎟ ⎠ = c o s^{- 1} (\frac{1}{3})$

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