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f-x-f-x-x-f-5-1-f-1-

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Question Number 190618 by mustafazaheen last updated on 07/Apr/23
f(x−f(x))=x ,f(5)=−1 f(−1)=?
f(x−f(x))=x,f(5)=−1f(−1)=?
Answered by aba last updated on 07/Apr/23
f(5−f(5))=5⇒ f(4)=5 f(4−f(4))=4⇒f(−1)=4
f(5−f(5))=5⇒f(4)=5f(4−f(4))=4⇒f(−1)=4

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