If sintheta-costheta=0,0^(@)ltthetalt90^...

If `sintheta-costheta=0,0^(@)ltthetalt90^(@)`, then the value of `sin^(4)theta+cos^(4)theta` is :

A

`""_(1)^(3)`

B

1

C

`""_(1)^(2)`

D

`""_(1)^(4)`

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The correct Answer is:

C

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