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### Question Asked by a Student from EXXAMM.com Team

** Q 2806823778. ** Consider the following relations among the

angles a., [3 and y made by a vector with the

coordinate axes.

I. `cos 2 alpha + cos 2 beta + cos 2 gamma = - 1`

II. `sin^2 alpha +sin^2 beta +sin^2 gamma = 1`

Which of the above statement(s) is/are correct?