详细内容

• 01

  sin(A+B)=sinAcosB+cosAsinB
  
  sin(A-B)=sinAcosB-cosAsinB?
  
  cos(A+B)=cosAcosB-sinAsinB
  
  cos(A-B)=cosAcosB+sinAsinB
  
  tan(A+B)=(tanA+tanB)/(1-tanAtanB)
  
  tan(A-B)=(tanA-tanB)/(1+tanAtanB)
  
  cot(A+B)=(cotAcotB-1)/(cotB+cotA)?
  
  cot(A-B)=(cotAcotB+1)/(cotB-cotA)

  
• 02

  双曲函数 sinh(a)=(e^a-e^(-a))/2 cosh(a)=(e^a+e^(-a))/2 tgh(a)=sinh(a)/cosh(a)

  
• 03

  和差化积
  
  sin(a)+sin(b)=2sin[(a+b)/2]cos[(a-b)/2]
  
  sin(a)-sin(b)=2cos[(a+b)/2]sin[(a-b)/2]
  
  cos(a)+cos(b)=2cos[(a+b)/2]cos[(a-b)/2]
  
  cos(a)-cos(b)=-2sin[(a+b)/2]sin[(a-b)/2]
  
  tanA+tanB=sin(A+B)/cosAcosB

  
• 04

  积化和差公式 sin(a)sin(b)=-1/2*[cos(a+b)-cos(a-b)] cos(a)cos(b)=1/2*[cos(a+b)+cos(a-b)] sin(a)cos(b)=1/2*[sin(a+b)+sin(a-b)]