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[" ** "8" .If "cos alpha+cos beta+cos ga...

[" ** "8" .If "cos alpha+cos beta+cos gamma=0=sin alpha+sin beta+sin gamma],[" prove that "cos^(2)alpha+cos^(2)beta+cos^(2)gamma=(3)/(2)],[=sin^(2)alpha+sin^(2)beta+sin^(2)gamma]

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