public Generic identity(Generic a, Generic b) {
Generic ta = new Cot(a).evalsimp();
Generic tb = new Cot(b).evalsimp();
return new Frac(ta.multiply(tb).subtract(JSCLInteger.valueOf(1)), ta.add(tb)).evalsimp();
}
public Generic identity(Generic a, Generic b) {
Generic ta = new Cot(a).evalsimp();
Generic tb = new Cot(b).evalsimp();
return new Frac(ta.multiply(tb).subtract(JSCLInteger.valueOf(1)), ta.add(tb)).evalsimp();
}