Who first invented trigonometries of negative angles?

While I read a book about math history, I was curious who invented the
concept of negative angles.

Of course negative angles are analogue of negative numbers. But I
think it was somewhat harder to conceive the notion because it is
possible through trigonometric functions.

So my questions are:

1. who first invented negative angles?

2. who first extended trigonometric functions to non-acute angles?

Thanks in advance.
.