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Jason is a fully-fledged interpreter for an extended version of AgentSpeak, a BDI agent-oriented logic programming language.

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package jason.functions;

import jason.JasonException;
import jason.asSemantics.DefaultArithFunction;
import jason.asSemantics.TransitionSystem;
import jason.asSyntax.NumberTerm;
import jason.asSyntax.Term;

/**
  Function: math.sin(N): encapsulates java Math.sin(N),
  returns the trigonometric sine of an angle.

  @author Jomi
*/
public class sin extends DefaultArithFunction  {

    public String getName() {
        return "math.sin";
    }

    @Override
    public double evaluate(TransitionSystem ts, Term[] args) throws Exception {
        if (args[0].isNumeric()) {
            return Math.sin(((NumberTerm)args[0]).solve());
        } else {
            throw new JasonException("The argument '"+args[0]+"' is not numeric!");
        }
    }

    @Override
    public boolean checkArity(int a) {
        return a == 1;
    }

}