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The equation "sin"^(6) x + "cos"^(6) x =...

The equation `"sin"^(6) x + "cos"^(6) x = lambda`, has a solution if

A

`lambda in [1//2, 1]`

B

`lambda in [1//4, 1]`

C

`lambda in [-1, 1]`

D

`lambda in [0, 1//2]`

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The correct Answer is:
B
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