cosA+cosB+cosC=sinA+sinB+sinC=0 THEN PROVE (1)cos3A+cos3B+cos3C=3cos(A+B+C), (2)sin3A+sin3B+sin3C=3SIN(A+B+C)

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cosA+cosB+cosC=sinA+sinB+sinC=0 THEN PROVE (1)cos3A+cos3B+cos3C=3cos(A+B+C), (2)sin3A+sin3B+sin3C=3SIN(A+B+C)

cosA+cosB+cosC=sinA+sinB+sinC=0 THEN PROVE (1)cos3A+cos3B+cos3C=3cos(A+B+C), (2)sin3A+sin3B+sin3C=3SIN(A+B+C)

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cosA+cosB+cosC=sinA+sinB+sinC=0 THEN PROVE (1)cos3A+cos3B+cos3C=3cos(A+B+C), (2)sin3A+sin3B+sin3C=3SIN(A+B+C)

cosA+cosB+cosC=sinA+sinB+sinC=0 THEN PROVE (1)cos3A+cos3B+cos3C=3cos(A+B+C), (2)sin3A+sin3B+sin3C=3SIN(A+B+C)

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