Method atan

rhino/src/main/java/org/mozilla/javascript/NativeMath.java:149–154

(
            Context cx, JSFunction f, Object nt, VarScope s, Object thisObj, Object[] args)

    }

    private static Object atan(
            Context cx, JSFunction f, Object nt, VarScope s, Object thisObj, Object[] args) {
        double x = ScriptRuntime.toNumber(args, 0);
        x = Math.atan(x);
        return ScriptRuntime.wrapNumber(x);
    }

    private static Object atanh(
            Context cx, JSFunction f, Object nt, VarScope s, Object thisObj, Object[] args) {