A.C1y1+C2y2+y3 B.C1y1+C2y2-(C1+C2)y3 C.C1y1+C2y2-(1-C1+C2)y3 D.C1y1+C2y2+(1-C1-C2)y3
A.Ccos2x+D(sin2x) B.D(sin2x) C.x[Ccos2x+D(sin2x)] D.x·D(sin2x)