Question:
If \(\alpha\), \(\beta\) and \(\gamma\) are the angles which a line makes with positive directions of x, y and z axes respectively, then which of the following is not true?
- A. \(cos^{2}\alpha+cos^{2}\beta+cos^{2}\gamma=1\)
- B. \(sin^{2}\alpha+sin^{2}\beta+sin^{2}\gamma=2\)
- C. \(cos~2\alpha+cos~2\beta+cos~2\gamma=-1\)
- D. \(cos~\alpha+cos~\beta+cos~\gamma=1\)