Can't get proper answer in tangent inverse method.

Question

//This is my tangent inverse method
public double arcTan(double x)
{
double total=0;
for(int i=1;i<=49;i++)
{
total=total+(power(-1,i+1)*power(x,(2*i)-1))/(2*i)-1;
}
return total;
}

//when I call It and try to find arcTan (3) it gives me 1.7493 but in calculator the value is 1.2490.

Need Help

Answer 1

Could you please publish your code at the playground and link it here? The power method is missing.