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由文[1]中的三弦定理是:如图1,已知PA、PB、PC是⊙O的三条弦,记∠APB=α,∠BPC=β,则PB·sin(α+β)=PC·sinα+
The three-string theorem in [1] is: As shown in Fig. 1, it is known that PA, PB and PC are three chords of ⊙O, and if PB = α and PCBPC = PC · sinα +