// 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 );

• The sec, cot, csc, asec, acot and acsc functions are missing. You can create them with simple trignometric identities, e.g.:
• The Java trig functions work in radians. To convert radians ⇔ degrees, use toDegrees and toRadians.
• Use Math.E for e, the base of the natural logarithms and Math.PI for π.