Question

已知f(x)=2x-1,g(x)=1/(x^2+1),求f(x^2),f[g(x)],g[f(x)+2]大神们帮帮忙

同上,高一数学题!

Answer 1

f(x^2)=2x^2-1 f[g(x)]=2/(x^2+1)-1=(1-x^2)/(x^2+1)g[f(x)+2]=1/[(2x+1)^2+1)=1/(4x^2+4x+2)