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两角和与差 sin(a+b)=sin a cos b +cos a sin b cos(a+b)=cos a cos b -sin a sin b sin(a-b)=sin a cos b -cos a sin b cos(a-b)=cos a cos b +sin a sin b tan(a+b)=(tan a +tan b )/(1-tan a tan b ) tan(a-b)=(tan a -tan b )/(1+tan a tan b ) (责任编辑：admin) |