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Homework help

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```
#1
24 Minutes Ago | Add to kulrik's Reputation | Flag Bad Post
```

Im having trouble with this problem:

The Maclaurin series for arctan(x) is a formula which allows us to compute an approximation to arctan(x) as a polynomial in x. The formula is:

```
arctan(x) = x - x3/3 + x5/5 - x7/7 + x9/9 - x11/11 + . . .
```

Write a method called calculateArctan in the class Mymath . The method reads in a double x, and a positive integer k, and prints out the partial sum from the first k terms in this series. Write a main method to test the method calculateArctan.

Sample output

```
Enter x:
0.5
Enter integer k:
3
The partial sum from the first k terms: 0.4645833333333333
The arctan of 0.5 : 0.4636476090008061
```

I started it out and this is all I got:

```
import java.util.Scanner;
public class MyMath
{
public void calculateArctan()
{
double x;
double sum;
double z;
int i=1;
Scanner input = new Scanner(System.in);
System.out.println("input x");
x=input.nextDouble();
double k;
System.out.println("input k");
z=0;
sum=0;
while (i<=k){
{ sum=sum + Math.pow(x, i)/i;
if(i%2==0)
sum=sum-Math.pow(x,i)/i;
z = z + 1;
}
}//end while
}
public static void main(String[]args)
{
MyMath m;
m = new MyMath();
m.calculateArctan();
}
}//end method
```

theres alot of errors, and im havin alot of trouble on it, so PLEASE HELP

*Edited 3 Years Ago by mike_2000_17*: Fixed formatting