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If sin^(4) theta + cos^(4) theta = l + 3...

If `sin^(4) theta + cos^(4) theta = l + 3 +k sin^(2) theta cos^(2) theta` then

A

`l+k=0`

B

`l-k=0`

C

`l+2k=0`

D

`2l+k=0`

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