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In which of the following sets the inequ...

In which of the following sets the inequality `sin^(6) x + cos^(6) x gt 5//8` holds good?

A

`( - pi//8, pi//8)`

B

`( 3pi //8, 5pi//8)`

C

`(pi//4,3pi//4)`

D

`(7pi//8, 9pi//8)`

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The correct Answer is:
A, B, D
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