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

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

A

`4sinA sinB sinC`

B

`4cosAcosBcosC`

C

`4cosAcosBsinC`

D

`2sinAsinBsinC`

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The correct Answer is:
A
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