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If A+B+C = (3pi)/(2),then cos2A+cos2B+co...

If `A+B+C = (3pi)/(2),then cos2A+cos2B+cos2C=`

A

`1-4cosA cosBcosC`

B

`4sinAsinB sinC`

C

`1+2 cosAcosBcosC`

D

`1-4sinAsinBsinC`

Text Solution

Verified by Experts

The correct Answer is:
D
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