1.

If f(x)=1-x-x^(3), .............

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SOLUTION :`f(X)=1-x-x^(3)`
`f(f(x))=1-f(x)-f^(3) (x)`
`f'(x)=-1-3x^(2)` (decreasing FUNCTION)
`:. f(x) lt 1-5X`
`1-x-x^(3) lt 1 -5x`
`x^(3)-4x gt 0`
`x(x^(2)-4) gt 0`


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