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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

` k = 0 `

B

` |k| le (1)/(2) `

C

` - (3)/(2) le k le (1)/(2) `

D

` - (1)/(2) le k le (3)/(2) `

Text Solution

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The correct Answer is:
A, B, C
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