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If `A+B+C=pi` then `sin2A+sin2B+sin2C=`

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If `A+B+C=pi` then `sin2A+sin2B+sin2C=`
A. `4 sin A * sin B * cos C`
B. `4 sin B * sin C * cos A`
C. `4 sin C * sin A * cos B`
D. `4 sin A * sin B * sin C `
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Correct Answer - A
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