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The equation sin^6 x + cos^6 x = k posse...

The equation `sin^6 x + cos^6 x = k` possesses solution if

A

`k ge 1`

B

`1/4 lt k lt1`

C

`1/4 le k lt 1`

D

`1/4 le k le 1`

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The correct Answer is:
D
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