Question

高一数学题，在线等

f(cosx)=2-sin2x,则f(sinx)=

Answer 1

f(sinx)=f[cos(90-x)]=2-sin(180-2x)=2+sin2x

Answer 2

cos(pi/2-a)=sinx
f(cosx)=2-sin2(pi/2-a)
＝2-sin(pi-2a)
=2-sin2a

Answer 3

2-sin2x

追问

有过程么