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4tan(a/2)=1-tan(a/2)得2tan(a/2)/(1-tan(a/2))=1/2 tan(a)=1/2 4sinb=sin(2a+b)+sinb=2sin(a+b)cos(a) 2sinb=sin(2a+b)-sinb=2cos(a+b)sin(a) 相除得2tan(a)=tan(a+b)=1 a+b=π/4
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