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(4sinx.cosy).cosz
[2(sin(x+y)+sin(x-y)].cosz
(2sin(x+y)cosz) +(2sin(x-y)cosz
karena x+y =180-z dan z =180-(x+y)
jadi
(2sin(180-z))cosz +(2 sin(x-y)cos(180-(x+y)
(2sinz.cosz) + (2 sin(x-y).(-cos(x+y))
sin2z+(sin(2x.sin2y)
sin2z-sin2xsin2y