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1-2sinAcosA=sin2A-2sinAcosA +cos2A
1-2sinAcosA=(sin2A+cos2A)- 2sinAcosA
1-2sinAcosA=1-2sinAcosA
#Jadi yang B terbukti benar#
Tambahan:
Sin2A+cos2A=1
Sin2A=1-cos2A
cos2A=1-sin2A
Kalau yg A sama C saya kurang yakin. Takut slah. Maaf.