请问和积互化公式的八个公式是什么?

1个回答

  • 积化和差公式:

    sinAcosB=1/2[sin(A+B)+sin(A-B)]

    sinBcosA=1/2[sin(A+B)-sin(A-B)]

    cosAcosB=1/2[cos(A+B)+cos(A-B)]

    sinAsinB=1/2[cos(A+B)-cos(A-B)]

    和差积化公式:

    sinA+sinB=2[sin(A+B)/2]*[cos(A-B)/2]

    sinA-sinB=2[cos(A+B)/2]*[sin(A-B)/2]

    cosA+cosB=2[cos(A+B)/2]*[cos(A-B)/2]

    cosA-cosB=-2[sin(A+B)/2]*[sin(A-B)/2]