Simple trig functions

[Chompy]

I've always thought it was weird that, graal has sin, cos and arctan, but not tan?

Anyways,

PHP Code:

function tan(a) {
  return sin(a)/cos(a);
}
function cot(a) {
  return 1/tan(a);
}
function csc(a) {
  return 1/sin(a);
}
function sec(a) {
  return 1/cos(a);
} 


As I said, simple functions, and it would be nice if they were put into as built-in functions and not in a lonely class