[" 4."4ftA+B+C=pi" al "sin2A+sin2B+sin2C...

[" 4."4ftA+B+C=pi" al "sin2A+sin2B+sin2C" al "4W],[" allid a "tilde ii],[[" (1) "4sin Asin Bsin C," (2) "R(cos A)/(2)(sin B)/(2)(cos C)/(2)],[" (3) "0," (4) at "(1)/(787)]]

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Theorem 4:sin A+sin B+sin C=4(cos A)/(2)(cos B)/(2)(cos C)/(2)

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