Cmath Library

[furkan]

How can I write my cmath library using functions? help me please!I donT know others.
I must not using include<cmath>
for example;

double sin(double x) //sin function
{return x-((x*x*x)/6.)+((x*x*x*x*x)/120.);}

double cos(double y) //cos function
{return 1-((x*x)/2.)+((x*x*x*x)/24.)-((x*x*x*x*x*x)/720.);}

[Moschops]

Pick a function. Look at wikipedia for how to calculate it. Write code to do that.

[furkan]

I will add

#include <iostream>
using namespace std;

double sin(double x)  //sin function
{return x-((x*x*x)/6.)+((x*x*x*x*x)/120.);}

double cos(double x)  //cos function
{return 1-((x*x)/2.)+((x*x*x*x)/24.)-((x*x*x*x*x*x)/720.);}

double tan(double x)  //tan function
{return x+(x*x*x/3.)+(2.*x*x*x*x*x/15.)+(17.*x*x*x*x*x*x*x/315.)+(62.*x*x*x*x*x*x*x*x*x/2835.);}

double arcsin(double x) {//arcsin function
if(x<-1 || x>1) {cout<<"not using this function ==>"; }
else {
x=x+(x*x*x/6.)+(3.*x*x*x*x*x/40.)+(5*x*x*x*x*x*x*x/112.)+(35*x*x*x*x*x*x*x*x*x/1152.);}

return x; }

double arccos(double x){//arccos function
  if(x<-1 || x>1) {cout<<"not using this function ==>"; }
else {     
x=0.5*3.14159-x-(x*x*x/6.)-(3.*x*x*x*x*x/40.)-(5.*x*x*x*x*x*x*x/112.);
return x;}}

double arctan(double x){//arctan function
       if(x<-1 || x>1) {cout<<"not using this function ==>"; }
else {
x= x-(x*x*x/3.)+(x*x*x*x*x/5.)-(x*x*x*x*x*x*x/7.);}
return x;}



double exp(double x)  //exp function but 12!
{return 1+x+(x*x/2.)+(x*x*x/6.)+(x*x*x*x/24.)+(x*x*x*x*x/120.)+(x*x*x*x*x*x/720.)+(x*x*x*x*x*x*x/5040.)
+(x*x*x*x*x*x*x*x/40320.)+(x*x*x*x*x*x*x*x*x/362880.)+(x*x*x*x*x*x*x*x*x*x/3628800.)+(x*x*x*x*x*x*x*x*x*x*x/39916800.)
+(x*x*x*x*x*x*x*x*x*x*x*x/479001600.); }


double fabs(double x){
       if(x<0) {x=x*-1;}
       else x=x;
       return x;}


int main () {
    double a,h;
    cin>>a;
   
                                                            cout<<"sin("<<a<<")="<<sin(a*(3.14159/180.))<<endl;

                                                            cout<<"cos("<<a<<")="<<cos(a*(3.14159/180.))<<endl;
									
                                                            cout<<"tan("<<a<<")="<<tan(a*(3.14159/180.))<<endl;

                                                            cout<<"arcsin("<<a<<")="<<arcsin(a)*(180./3.141)<<endl;

							                                cout<<"arccos("<<a<<")="<<arccos(a)*(180./3.141)<<endl;

							                                cout<<"arctan("<<a<<")="<<arctan(a)*(180./3.141)<<endl;

                                                            cout<<"exp("<<a<<")="<<exp(a)<<endl;
								
							    cout<<"fabs("<<a<<")="<<fabs(a)<<endl;
          
          system("color c7");
          system("pause");
    }

[Moschops]

In your fabs functions, what's
else x=x*1;
for? Seems a bit pointless.

[furkan]

help me please I made all function but I didn'T make log(x) and ln(x) how can I write???