A line makes the same angle theta with X...

A line makes the same angle `theta` with X-axis and Z-axis. If the angle `beta`, which it makes with Y-axis, is such that `sin^2(beta)=3sin^2theta`, then the value of `cos^(2)theta` is

`2/3`

`1/5`

`3/5`

`2/5`

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