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Level 2

倍半 积化和差 和差化积


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S(A+B)=
SACB+CASB
S(A-B)=
SACB-CASB
C(A+B)=
CACB-SASB
C(A-B)=
CACB+SASB
T(A+B)=
(TA+TB)/(1-TATB)
T(A-B)=
(TA-TB)/(1+TATB)
C2A=2(CA)^2-1=
1-2(SA)^2
CA=2(C0.5A)^2-1=
1-2(S0.5A)^2
C(0.5A)=
根号[(1+CA)/2]
S(0.5A)=
根号[(1-CA)/2]
T(0.5A)=根号[(1-CA)/(1+CA)]=
SA/(1+CA)=(1-CA)/SA
CACB=
0.5[C(A+B)+C(A-B)]
SASB=
-0.5[C(A+B)-C(A-B)]
SACB=
0.5[S(A+B)+S(A-B)]
CASB=
0.5[S(A+B)-S(A-B)]
C[(X+Y)/2]C[(X-Y)/2]=
0.5(CX+CY)
S[(X+Y)/2]S[(X-Y)/2]=
-0.5(CX-CY)
S[(X+Y)/2]C[(X-Y)/2]=
0.5(SX+SY)
C[(X+Y)/2]S[(X-Y)/2]=
0.5(SX-SY)