The equation sin^(4) x + cos^(4) x + si...

The equation ` sin^(4) x + cos^(4) x + sin 2x + k = 0 ` must have real solutions if :

A

`-1/2 le alpha le 1/2`

B

`-3 le alpha le 1`

C

`-3/2 le alpha le 1/2`

D

`-1 le alpha le 1`

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The correct Answer is:

C

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