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A line makes an angle theta with the x-a...

A line makes an angle `theta` with the x-axis and the y-axis. If it makes an angle `alpha` with the z - axis such that `sin^(2)alpha= 3sin^(2)theta`, then `cos ^(2)theta` is equal to

A

`(sqrt3)/(2)`

B

`(3)/(4)`

C

`(3)/(5)`

D

`(1)/(2)`

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The correct Answer is:
C
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