A+B+C=π prove that 2(1+sinA/2sinB/2sinC/2)=cos square A/2 *cos square B/2*cos squareC/2

A+B+C=π prove that 2(1+sinA/2sinB/2sinC/2)=cos square A/2 *cos square

1.	A+B+C=π prove that 2(1+sinA/2sinB/2sinC/2)=cos square A/2 cos square B/2cos squareC/2
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