求证三角形ABC中(sinA/2)^2+(sinB/2)^2+(sinC/2)^2=1-2sinA/2sinB/2sinC/2

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求证三角形ABC中(sinA/2)^2+(sinB/2)^2+(sinC/2)^2=1-2sinA/2sinB/2sinC/2求证三角形ABC中(sinA/2)^2+(sinB/2)^2+(sinC/

求证三角形ABC中(sinA/2)^2+(sinB/2)^2+(sinC/2)^2=1-2sinA/2sinB/2sinC/2
求证三角形ABC中(sinA/2)^2+(sinB/2)^2+(sinC/2)^2=1-2sinA/2sinB/2sinC/2

求证三角形ABC中(sinA/2)^2+(sinB/2)^2+(sinC/2)^2=1-2sinA/2sinB/2sinC/2
我从该式往后推的,你写的时候从后往前就行了\x0dPS:不要把思考的机会留给别人,^_^\x0d我是一名大二的学生\x0d