[" 58.If "A+B+C=270^(@)" ,then "cos2A+co...

[" 58.If "A+B+C=270^(@)" ,then "cos2A+cos2B+cos2C=],[[" (1) "1-4cos A cos B cos C," (2) "4sin A sin B sin C],[" (3) "1+2cos A cos B cos C," (4) "1-4sin A sin B sin C]]

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