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If sin theta + cos theta = a " then " s...

If ` sin theta + cos theta = a " then " sin^(4) theta + cos^(4) theta =`

A

`1- 1/2 (a^(2)-1)^(2)`

B

`1 - 1/2 (a^(2)+1)^(2)`

C

`1 + 1/2 (a^(2)+1)^(2)`

D

`1 + 1/2 (a^(2)-1)^(2)`

Text Solution

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