exam Maths Puzzle Numerical Ability

if f(x)=log((1+x)/(1-x))then prove that 2f(x)=f((2x)/1+x2))
sir x2 is x squre

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exam Other Question

Ellie is 33 years old. This is three times as old as Sophie was when Ellie was as old as Sophie is now."
How old is Sophie now?
What does the graph of y=1 look like?