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Question
If f(x) = x2 – 1. Find fof
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Solution
f(x) = x2 – 1
fof(x) = f(fx)) = f(x2 – 1)
= (x2 – 1)2 – 1;
= x4 – 2x2 + 1 – 1
= x4 – 2x2
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