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If cos^2 theta - sin^2 theta = 1/3, wher...

If `cos^2 theta - sin^2 theta = 1/3`, where `0 le theta le pi/2`, then the value of `cos^4 theta - sin^4 theta` is

A

`(1)/(3)`

B

`(2)/(3)`

C

`(1)/(9)`

D

`(2)/(9)`

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The correct Answer is:
A
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