The angle between vectors a=i+j-k and b=i-j+k is __________ . - Vidyadip

MCQ

The angle between vectors $\vec{a}=\hat{i}+\hat{j}-\hat{k}$ and $\vec{b}=\hat{i}-\hat{j}+\hat{k}$ is __________ .

A
$\cos ^{-1}\left(\frac{2}{3}\right)$
✓
$\pi-\cos ^{-1}\left(\frac{1}{3}\right)$
C
$\pi-\cos ^{-1}\left(\frac{2}{3}\right)$
D
$\cos ^{-1}\left(\frac{1}{3}\right)$

✓

Answer

Correct option: B.

$\pi-\cos ^{-1}\left(\frac{1}{3}\right)$

B

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