Class 12MathematicsTHREE DIMENSIONAL GEOMETRYSystem of co-ordinates, Direction cosines and direction ratios, Projection
EasyIf a line makes angles $90^{\circ}, 135^{\circ}$ and $45^{\circ}$ with the positive $X, Y$ and $Z$ axis respectively,then its direction cosines are
- A$\left(0, \frac{1}{2}, \frac{1}{\sqrt{2}}\right)$
- B$\left(0, \frac{-1}{\sqrt{2}}, \frac{1}{\sqrt{2}}\right)$
- C$\left(1, \frac{1}{\sqrt{2}}, \frac{1}{\sqrt{2}}\right)$
- D$\left(1, \frac{-1}{\sqrt{2}}, \frac{1}{\sqrt{2}}\right)$
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