1:Show that the function f(x)=ln(x2 +1) is one-to-one for x > 0 . Graphing does not count as proof. (Hint: Use the derivative of the function.)
2: Find a formula for the inverse function f-1 (x) of f (x)= 2x/x+1. Verify that f (f -1(3))= 3 and f -1(f (5))=5
need help for the above 2 questions
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