This course Is about Trigonometry .Trigonometry is useful.
If you would like to learn a bit about trigonometry, or brush up on it, then
read on. These notes are more of an introduction and guide than a full course.
For a full course you should take a class or at least read a book. After
following this course students able to solve problems on trigonometric
functions and identities, among other important concepts, to improve their math
problem solving skills so they can find the solution to their Trigonometry homework
For more complete about trigonometry ,the material can be downloaded here