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A.f1(x)£¬f2(x)£¬f3(x)Ϊ¡°Í¬ÐΡ±º¯Êý£º

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f1(x)=sinx+cosx=sin(x+),f2(x)=sinx+,

f3(x)=sinx,ËùÒÔf1(x)Óëf2(x)Ϊ¡°Í¬ÐΡ±º¯Êý,ÇÒËüÃÇÓëf3(x)²»Îª¡°Í¬ÐΡ±º¯Êý.

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