题目内容
若f(sinx)=2cosx+1,则f()的值为
A.2
B.1-
C.1+
D.1±
(文科)若f(sinx)=2-cos2,则f(cosx)=________
A.2-sin2x
B.2+sin2x
C.2-cos2x
D.2+cos2x
若f(sinx)=2-cos2x,则f(cosx)=
函数f(x)=x+sinx+1(x∈R),若f(a)=2,则f(-a)的值为________.
A.2-sin2x
B.2+sin2x
C.2-cos2x
D.2+cos2x
B.2+sin2x
D.2+cos2x