trigonometry : Java Glossary

// calc sine of angle theta, expressed in radians
double s = Math.sin( theta );

static import java.lang.Math.*;
...
// calc sine of angle theta, expressed in radians
double s = sin( theta );

For the most part, all the trig functions you need are in the java.lang.Math class with the same names mathematicians use namely: sin, cos, tan, asin, acos, atan, sinh, cosh, tanh.

• Warning! The trig functions work in radians not degrees. To convert radians ⇔ degrees, use Math. toDegrees and Math. toRadians.
• The sec, cot, csc, asec, acot and acsc functions are missing. You can create them with simple trignometric identities, e.g.:
• Use Math.E for e, the base of the natural logarithms and Math. PI for π.
• Java has two functions for computing arctangent: java.lang.Math.atan and atan2. They work in radians. The result of atan will always be range -pi/2 to +pi/2. The result of atan2 will be in the range -pi to +pi in the quadrant consistent with the signs of the two arguments.

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