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A line makes an angel theta with each o...

A line makes an angel `theta` with each of the x-and z-axes. If the angel `beta,` which it makes with the y-axis, is such that `sin^2beta=3sin^2theta`,then `cos^2theta` equals a. `2/3` b. `1/5` c. `3/5` d. `2/5`

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