Consider the following relations among the angles $\alpha$, $\beta, \gamma$ made by a vectors with the coordinate axes: 1. $\cos 2 \alpha+\cos 2 \beta+\cos 2 \gamma=-1$ 2. $\sin ^2 \alpha+\sin ^2 \beta+\sin ^2 \gamma=1$ Which of the above is/are correct?

• Correct answer
  A

  1 only
• B

  2 only
• C

  Both 1 and 2
• D

  Neither 1 nor 2

Hence, the correct answer is option: 'A'.