Calculadora

#include <iostream>
#include <math.h>
#include <iomanip>
using namespace std;

long double seno(long double x,int y);
long double coseno(long double x,int y);
long double senoh(long double x,int y);
long double cosenoh(long double x,int y);
long long int factorial(int b);
int i,j;
main (){
    double x,y;
    int opc;

    cout<<"Ingrese el valor de z: "<<endl;
    cin>>x;
    cout<<"Ingrese cuantos terminos desea en la serie (a)\n Recomandado usar un valor menor a 10: "<<endl;
    cin>>y;
    system("cls");
    cout<<"1. Seno("<<x<<")\n2. Coseno("<<x<<")\n3. Senoh("<<x<<")\n4. Cosenoh("<<x<<")\nIngrese una Opcion: "<<endl;
    cin>>opc;
    cout<<fixed<<setprecision(7);
    switch (opc){
        case 1:
            cout<<"seno = "<<seno(x,y)<<endl;
        break;

        case 2:
            cout<<"coseno = "<<coseno(x,y)<<endl;
        break;

        case 3:
            cout<<"senoh = "<<senoh(x,y)<<endl;
        break;

        case 4:
            cout<<"cosenoh = "<<cosenoh(x,y)<<endl;
        break;

    }



}

long double seno (long double x, int y){
    double acum=0;
    for (i=0;i<=(y+1);i++){
        acum=acum+pow(-1,i)*(pow(x,(2*i+1))/factorial(2*i+1));

    }
    return acum;

}

long double coseno(long double x,int y){
    double acum=0;
    for (i=0;i<=(y+1);i++){
        acum=acum+pow(-1,i)*(pow(x,(2*i))/factorial(2*i));

    }
    return acum;
}
long double senoh(long double x,int y){
    double acum=0;
    for (i=0;i<=(y+1);i++){
        acum=acum+(pow(x,(2*i+1))/factorial(2*i+1));

    }
    return acum;
}

long double cosenoh(long double x,int y){
    double acum=0;
    for (i=0;i<=(y+1);i++){
        acum=acum+(pow(x,(2*i))/factorial(2*i));

    }
    return acum;
}

long long int factorial(int b){
    long long int acum2=1;
    for (j=0;j<=b;j++){
        if (j==0){
            acum2=1;
        }else {
            acum2=acum2*j;
        }
    }
    return acum2;

}