A vector has length 21 and direction ratios 2, -3, 6

MATHEMATICS · Subjective · CBSE · Mathematics · Three-Dimensional Geometry · Three-Dimensional Geometry

Problem

A vector r\mathbf{r} has length 21 and direction ratios 2, -3, 6. Find the direction cosines and components of r\mathbf{r} , given that r\mathbf{r} makes an obtuse angle with XX-axis.

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