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Question
If f(x) = x2 – 1. Find fofof
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Solution
fofof = fof(f(x))
= fof (x4 – 2x2)
= f(f(x4 – 2x2))
= (x4 – 2x2)2 – 1
= x8 – 4x6 + 4x4 – 1
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