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cos(A-B)=cosAcosB(1+yn/xm)=(x/(x^2+y^2)^(1/2))(m/(m^2+n^2)^(1/2))*(1+yn/xm)
åå 为aåé模(x^2+y^2)^(1/2)ï¼båé模(m^2+n^2)^(1/2)
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