It is a branch of maths.
The word 'trigonometry' means, 'measuring triangles'.
Trigon (polygon) = triangle
metry = to measure.
Both parts of the roots are from Classical Greece.
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"It is a branch of mathematics that studies the relationships involving lenghts and angles of triangles". That's what i found online.
The sign function is used to represent the absolute value of a number when used in trigonometry. It is also referred to as the signum function in math.
Depending on your career, you may or may not need trigonometry. If your job does not require a lot of math, it is unlikely that you will use trigonometry very often, however, this is not a reason not to study it. The skills and discipline developed in your trigoometry class will help you no matter what career you choose.
Trigonometry is a mathematical tool that is part of various other forms of mathematics and is used in all sorts of science and engineering; for example, the sine function in trigonometry turns out to be applicable to sine waves that are formed by alternating electrical currents which are used to power your computer which is the basic tool that you use in information technology.
I was wondering if you knew but I think sophomore or junior. I was two grade levels ahead in math so I don't know for sure.
It is a number - in trigonometry or elsewhere.