Amongst the lay public of non-mathematicians and non-scientists, trigonometry is known chiefly for its application to measurement problems, yet is also often used in ways that are far more subtle, such as its place in the theory of music; still other uses are more technical, such as in number theory. The mathematical topics of Fourier series and Fourier transformsrely heavily on knowledge of trigonometric functions and find application in a number of areas, including statistics.
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I think you need to understand algebra 2 before you begin trigonometry
Amongst other factors, the answer depends onwhere you took trigonometry (which country/school),what level you studied,what you want to do in life.
plane trigonometry spherical trigonometry
The main kinds are plane trigonometry and solid trigonometry. The latter will include trigonometry in hyper-spaces.
Colleges offer multiple semester-long classes in trigonometry; it's not something we can teach you in a few paragraphs on a website. If you're really interested, I recommend you take a class at a community college.