How to add trigonometry n inverse trigonometry in c++ ?

Question

i m trying to make a scientific calculator using switch case!

Answer 1

#include <math.h>

#define PI 3.14159265

int main ()
{
double angle, result;
angle = 30.0;
result = sin (angle*PI/180); //sin30
angle = asin(result) * 180 / PI; //30.0
return 0;
}

triginometric function needs angle (in radian) as parameter. Here 30 degrees in converted into radian as:
30 * PI / 180
This value is supplied to sin function to calculate the value of sin30

Inverse trigonometric function needs values according to the value of respespective trigonometric functions like. asin can have value between -1 to 1, atan can have any number ...

Answer 2

thnx but can u explain what is written in parentheses n why