What are the 6 basic trigonometric functions?
These are all derived from the ratio's in a (right-angled) triangle.
If we divide the length of a side by the length of another side, we have a trigonometric function.
These three are called the basic functions.
You will find them on most calculators.
The other three are:
Normally these are not on a calculator, as they are easy to get from the other three.
(picture from Wikipedia) **