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((fog)oh)(x)
= f(g(h)(x)
= f(1(2x-x²+1)-1
=f(2x-x²+1-1)
=f(2x-x²)
=2(2x-x²)-7
=4x-2x²-7
=2x²-4x-7
Coba di cek ulang takut ada kesalahan, jika memang ada mohon di maafkan