2个回答
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import java.util.Scanner;
public class Test{
public static void main(String[] args){
System.out.print("输入x:");
Scanner in=new Scanner(System.in);
double x=in.nextDouble();
System.out.println("cos"+x+"="+Taylor(x));
}//COSx=1-x2/2!+x4/4!-x6/6!+x8/8!..
public static double Taylor(double x){
int i,k;
long fac=1;//阶乘
double n=1,y=1,sum=1;
for(i=2;(Math.abs(y))>=1e-8;i+=2)
{ n=n*(-1);
for(k=1;k<=i;k++)
fac=fac*k;
y=Math.pow(x, i)*n/fac;
sum+=y;
fac=1;
}
return sum;
}
}
public class Test{
public static void main(String[] args){
System.out.print("输入x:");
Scanner in=new Scanner(System.in);
double x=in.nextDouble();
System.out.println("cos"+x+"="+Taylor(x));
}//COSx=1-x2/2!+x4/4!-x6/6!+x8/8!..
public static double Taylor(double x){
int i,k;
long fac=1;//阶乘
double n=1,y=1,sum=1;
for(i=2;(Math.abs(y))>=1e-8;i+=2)
{ n=n*(-1);
for(k=1;k<=i;k++)
fac=fac*k;
y=Math.pow(x, i)*n/fac;
sum+=y;
fac=1;
}
return sum;
}
}
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