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If f is an even function, then find the ...

If f is an even function, then find the realvalues of x satisfying the equation `f(x)=f((x+1)/(x+2))`

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The correct Answer is:
`x={(-1+sqrt(5))/(2),(-1-sqrt(5))/(2),(-3+sqrt(5))/2,(-3-sqrt(5))/2}`
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