Trigonometric functions: Difference between revisions

double Pi = 4.0 * atan(1.0); // in D math module, PI is a _real_ constant of πp

45e pi f* 180e f/ \ radians

cr fdup fsin f. \ also available: fsincos ( r -- sin cos )

cr fatan f. \ also available: fatan2 ( r1 r2 -- atan[r1/r2] )

public static void main(String[] args) {

//Pi / 4 is 45 degrees. All answers should be the same.

double radians = Math.PI / 4;

double degrees = 45.0;

//sine

System.out.println(Math.sin(radians) + " " + Math.sin(Math.toRadians(degrees)));

//cosine

System.out.println(Math.cos(radians) + " " + Math.cos(Math.toRadians(degrees)));

//tangent

System.out.println(Math.tan(radians) + " " + Math.tan(Math.toRadians(degrees)));

//arcsine

double arcsin = Math.asin(Math.sin(radians));

System.out.println(arcsin + " " + Math.toDegrees(arcsin));

//arccosine

double arccos = Math.acos(Math.cos(radians));

System.out.println(arccos + " " + Math.toDegrees(arccos));

//arctangent

double arctan = Math.atan(Math.tan(radians));

System.out.println(arctan + " " + Math.toDegrees(arctan));