数学学霸帮帮忙 50
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设x = A + B
cos(C) = 2cosA * sin(b - p /6)
cos(p - x) = 2cosA * sin(b - p/6)
-cos(A + B) = 2cosA * sin(b - p/6)
sinAsinB-cosAcosB = 2cosA*(sinBcos(p/6) - cosBsin(p/6))
sinAsinB-cosAcosB = (根号3)cosAsinB - cosAcosB
sinAsinB = (根号3)cosAsinB
b != 0
sinA = (根号3) cosA
A = p / 3
cos(C) = 2cosA * sin(b - p /6)
cos(p - x) = 2cosA * sin(b - p/6)
-cos(A + B) = 2cosA * sin(b - p/6)
sinAsinB-cosAcosB = 2cosA*(sinBcos(p/6) - cosBsin(p/6))
sinAsinB-cosAcosB = (根号3)cosAsinB - cosAcosB
sinAsinB = (根号3)cosAsinB
b != 0
sinA = (根号3) cosA
A = p / 3
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