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Q 1337523482.     A line makes angle `theta` with `x` and `z` axis. If it makes angle `beta` with `y` axis, where `sin^2 beta=3sin^2theta`, then `cos^2 theta=`?

A

`frac{2}{3}`

B

`frac{1}{5}`

C

`frac{3}{5}`

D

`frac{2}{5}`

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