sin()

We will get sin value of any number by using sin() function.
sin(x) 
x = angular value in radian ( not in degree ) We will declare PI as constant as radian input value.

Example sin()

#include <stdio.h>
#include <math.h>
#define PI 3.14159265
int main(void){
     float  x,ret;
     x=90; // input in degree 
     ret=sin(x*PI/180);
     printf("sing(x)=%.1f", ret);
     return 0;
}
The above code will give this output.
sin(x)= 1.0

Example cos()

#include <stdio.h>
#include <math.h>
#define PI 3.14159265
int main(void){
     float  x,ret;
     x=180;
     ret=cos(x*PI/180);
     printf("cos(%.0f)=%.2f",x, ret);
     return 0;
}
Output
cos(180)=-1.00

Example tan()

#include <stdio.h>
#include <math.h>
#define PI 3.14159265
int main(void){
     float  x,ret;
     x=45;
     ret=tan(x*PI/180);
     printf("tan(%.0f)=%.2f",x, ret);
     return 0;
}
Output
tan(45)=1.00
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