操作方法
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)]