f(x)=x²-1
φ(x)=x+1
f(φ(x))=(x+1)²-1=x²+2x+1-1=x²+2x
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f(x)=x²-1
φ(x)=x+1
f(φ(x))=(x+1)²-1=x²+2x+1-1=x²+2x