A.y=丨x丨B.C.y=tanxD.y=2x+1
A.g(x)=xf(x)B.g(x)=(cosx)f(x)C.g(x)=x2f(x)D.g(x)=2+f(x)
A.[1,2]B.[0,2]C.(0,1)∪(1,2]D.(1,2)