If a straight line makes angles $\alpha,\beta,\gamma$ with the axes of coordinates, then $cos2\alpha+cos2\beta+cos2\gamma$ is equal to:

If a straight line makes angles $\alpha,\beta,\gamma$ with the axes of coordinates, then $cos2\alpha+cos2\beta+cos2\gamma$ is equal to:
1). 2
2). 1
3). -1
4). -2

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