1.

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

Answer»

`( - pi//8, pi//8)`
`( 3PI //8, 5pi//8)`
`(pi//4,3pi//4)`
`(7pi//8, 9pi//8)`

ANSWER :A::B::D


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