A+B+C = 270º =sin 2A-sin 2B+sin 2C=
1)4 sin Acos B sin C
2) 4cos Asin B cos C
3) -4sin A cos B sin C
4) -4cos Asin B cos C
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Step-by-step explanation:
1 .4sinAcosBsinC this is super answer today
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