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If sin alpha + cos alpha = b, then sin 2...

If sin `alpha + cos alpha `= b, then sin 2`alpha` is equal to

A

`b^(2)-1, if b le sqrt2`

B

`b^(2)-1," if "b gt sqrt2`

C

`b^(2)-1," if "b ge 1`

D

`b^(2)-1," if "b ge sqrt2`

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The correct Answer is:
B
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