If A+B+C=180°,prove thatsin(B+2C)+sin(C+2A)+sin(A+2B)=4sin(B-C)/2sin(C-A)/2sin(A-B)/2

If A+B+C=180°,prove thatsin(B+2C)+sin(C+2A)+sin(A+2B)=4sin(B-C)/2sin(

1.	If A+B+C=180°,prove thatsin(B+2C)+sin(C+2A)+sin(A+2B)=4sin(B-C)/2sin(C-A)/2sin(A-B)/2
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