設(shè)ez-xyz=0,求
A.yx+2-3yx+1+2yx=0 B.yx-3yx-1+2yx-2=0 C.yx+1-2yx=-8 D.yx+1-2yx=8
A.1,cos2x,sin2x B.1,x,x2 C.sin2x,ex,ex+1 D.0,ex,xrx