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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,ifblesqrt2`

B

`b^2 -1,ifb gt sqrt2`

C

`b^2 -1 ,if bge1`

D

`b^2 -1,if bge sqrt2`

Text Solution

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The correct Answer is:
A
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