trignometric inverse problem

[Sharan123]

IT shows problem for acos etc but y it says it cant convert double into binary but its in double help please !!!!!!

 #include<iostream>
#include<conio.h>
#include<math.h>
#define PI 3.14
using namespace std;
int main()
{
  double cos1, result;
  cos1 = 60.0;
  result = cos ( cos1 * PI / 180.0 );
cout<<"COS 60:"<<result<<endl;
double sin1 ;
sin1= 60.0;
result= sin (sin1*PI/180.0);
cout<<"SIN 60 :"<<result<<endl;
double tan1=60.0;
result=tan(tan1*PI/180.0);
cout<<"TAN 60  :"<<result<<endl;
double acos1=.5;
 result=acos*(acos1)*180/PI;
cout<<"ACOS .5 :"<<result<<endl;
double asin1=.5;
result=asin*(asin1)*180/PI;
cout<<"ASIN1 .5 :"<<result<<endl;
double atan1=.5;
result=atan*(atan1)*180/PI;
cout<<"ATAN1 .5 :"<<result<<endl;

}

[MiiNiPaa]

result=tan(tan1*PI/180.0);
result=acos*(acos1)*180/PI;

Why such difference

[Sharan123]

tan is for normal tangent and acos is for inverse cosine

[Chervil]

But why does one have an intervening '*' symbol,but not the other?

[Sharan123]

yes both of u were right i dont why multiply sign should have such an affect but still the inverse thing all of them show a wrong answer now how to solve this

[Chervil]

The answers seem correct to me (except they are approximate, due to the value of PI used).

#include <iostream>
#include <cmath>

const double PI = 3.1415926535897932385;

using namespace std;

int main()
{
    double result;
    double angle = 60.0;

    result = cos(angle*PI/180.0);
    cout << "COS " << angle << " : " << result << endl;

    result = sin(angle*PI/180.0);
    cout << "SIN " << angle << " : " << result << endl;

    result = tan(angle*PI/180.0);
    cout << "TAN " << angle << " : " << result << endl;

    double value = 0.5;
    result = acos(value)*180/PI;
    cout <<"ACOS " << value << " : " << result << endl;

    result = asin(value)*180/PI;
    cout <<"ASIN " << value << " : " << result << endl;

    result = atan(value)*180/PI;
    cout << "ATAN " << value << " : " << result << endl;

}

[Sharan123]

The answers for asin and atan should be 60 and 60 but they are 30 and 26.5

[Chervil]

Did you check with a calculator?
https://www.google.com/#q=asin%28.5%29+in+degrees
https://www.google.com/#q=atan%28.5%29+in+degrees

[Sharan123]

i am sorry u are right i must be wrong than isnt asin equal inverse of sin or sin-1 sign in calculator

[Chervil]

You used 0.5 in all three of asin, acos and atan. But you should have used 0.5, 0.866025 and 1.73205 respectively.

[Sharan123]

oh yes sorry thanks for helping