The angle between a line with direction ratios proportional to 2, 2, 1 and a line…

MATHEMATICS · Single correct · CBSE · Mathematics · Three-Dimensional Geometry · Three-Dimensional Geometry

Problem

The angle between a line with direction ratios proportional to 2, 2, 1 and a line joining

(3, 1, 4)

(7, 2, 12)

, is (1)

\cos^{-1}\left(\frac{2}{3}\right)

(2)

\cos^{-1}\left(-\frac{2}{3}\right)

(3)

\tan^{-1}\left(\frac{2}{3}\right)

(4) None of these