An inequation of the form `f^(1/2n)(x) < g(x)`

An inequation of the form f^((1)/(2)n)(x)

An equation of the form f^(2n)(x)=g^(2n)(x) is equivalent to f(x)=g(x)

An inequation of the form f(a^(x))>=0

An equation of the form (f(x))^((1)/(2n))=g(x) equivalent to the system g(x)>=0;f(x)=g^(2n)(x)

An equation of the form (a-f(x))^((1)/(n))+(b+f(x))^((1)/(pi))=g(x)

An inequation in the form log_(g(x))f(x)>=0

An inequation in the form log _(g(x))f(x)<=0

An inequation in the form log_(h(x))f(x)>=log_(h(x))g(x)

An inequation in the form log_(h(x))f(x)<=log_(h(x))g(x)

If f_(1)(x)=|x|-2| and f_(2)(x)=|f_(n-1)(x) for all n>=2,n in N, then number of solution of the equation f_(2015)(x)=2 is