f(x) = (√(|x|) / (1 + |x|)) * (1/√(1 - (x^2)/2)) * ∫(-1)^(ln|x|) dx 
+ ∑(n=1 to ∞) (1/n!) * (x^n) 
- ∏(i=2 to ∞)(1 + (1/i)) 
* cos(π*x^2 / 2) * sin(π*x / 4)  
/ ((1 + |x|)! * (√(1 - x^2))^(2/π))

X=3
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