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分別作直線y1=-x及正切曲線y2=tanx 則兩者的交點即為x+tanx=0的根 則在每一個週期π內,y1與y2都有一個交點, 在x>0為正根,交點都位於使tanx為負數的半週期內,囙此有:π/2a(n+2)+an,即4對3錯.
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