Start trigonometric module

* Add some auxiliar functions.
* Add funcion to sin function.
Add cos trigonometric function

* Add cos trignometric function just like the sin.
* Add some demos.
Add tan trigonometric function

* Add cos trigonometric function just like the sin.
* Add some demos.
Add id value on start

It useful to have one id for every math element and now it is
setup in the start.