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Question
Choose the correct alternative:
If sin α + cos α = b, then sin 2α is equal to
Options
b2 − 1, if `"b" ≤ sqrt(2)`
b2 − 1, if `"b" > sqrt(2)`
b2 − 1, if b ≥ 1
b2 − 1, if `"b" ≥ sqrt(2)`
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Solution
b2 − 1, if `"b" ≤ sqrt(2)`
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