三角函数公式：sin(A+B)=sinA*cosB+cosA*sinBsin(A-B)=sinA*cosB-cosA*sinBcos(A+B)=cosA*cosB-sinA*sinBcos(A-B)=cosA*cosB+sinA*sinBtan(A+B)=(tanA+tanB)/(1-tanA*tanB)tan(A-B)=(tanA-tanB)/(1-tanA*tanB)...