FIND THE SIN AND COS VALUES WITHOUT USING MATH.H

Here is a C program that calculates the sin and cos values without using any predefined library functions.

I have used one other function for factorial calculation and simply called it in main() with appropriate arguments to get the desired results.

The formulas that i used are:- 

SOURCE CODE :-
/*****************************************************************************/

#include<stdio.h>
#include<math.h>
#include<conio.h>

float f(int);
int main()
{
int i,j;
float num,sum_sin=0,sum_cos=1;
clrscr();
printf("ENTER ARGUMENT IN RADIANS : ");
scanf("%f",&num);

for(i=0,j=0;i<20;i=i+2,j++)
{
sum_sin+=pow(-1,j)*pow(num,i+1)/f(i+1);
}

for(i=2,j=1;i<20;i=i+2,j++)
{
sum_cos+=pow(-1,j)*pow(num,i)/f(i);
}



printf("\n\nsin(%f) = %f\n",num,sum_sin);
printf("ACTUAL VALUE OF sin(%f) = %f\n",num,sin(num));

printf("\n\ncos(%f) = %f\n",num,sum_cos);
printf("ACTUAL VALUE OF sin(%f) = %f",num,cos(num));

getch();
return 1;
}


float f(int i)
{
int j;
float fact=1;
for(j=0;j<i;j++)
fact*=(j+1);
return fact;
}

/*****************************************************************************/

OUTPUT :-