Angle between diagonals of a parallelogram whose sides are represented by and

MATHEMATICS · Single correct · CBSE · Mathematics · Vector Algebra · Vector Algebra

Problem

Angle between diagonals of a parallelogram whose sides are represented by

a = 2\hat{i} + \hat{j} + \hat{k}

and

b = \hat{i} - \hat{j} - \hat{k}

(1)

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

(2)

\cos^{-1}\left(\frac{1}{2}\right)

(3)

\cos^{-1}\left(\frac{4}{9}\right)

(4)

\cos^{-1}\left(\frac{5}{9}\right)