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

If `A + B + C = (3pi)/2` then `cos2A +cos2B + cos2C+4 sin A sin B sin C = 0`.If `A+ B+ C = 0` , then `sin 2A+sin 2B +sin 2C+ 4 sin A sin B sin C = 0`

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