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If f(x)=x^3- 3x+1, then the number of di...

If `f(x)=x^3- 3x+1`, then the number of distinct real roots of the equation `f(f(x))=0` is

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`f(f(x))=0`
`f(x)=x^3-3x+1`
`f'(x)=3x^2-3`
`=3(x-1)(x+1)`
`f'(x)>0`
`f(f(x))=0`
`f(0)=0`
1)When t=a
...
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