sinA*sinB:
sin(A+B)=sinA*cosB+cosA*sinB;
cos(A+B)=cosA*cosB-sinA*sinB;
cos(A-B)=cosA*cosB+sinA*sinB
sinAsinB=0.5*[cos(A-B)-cos(A+B)]
sinA*sinB的hilbert变换是多少
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