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If f(x)=sin^(6) x + cos^(6) x for x in...

If `f(x)=sin^(6) x + cos^(6) x ` for ` x in R `, then f(x) lies in the interval

A

`[(1)/(4),1]`

B

`[(1)/(3),(3)/(4)]`

C

`[(3)/(4),1]`

D

none of these

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A
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