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.
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The basic circular functions are sine, cosine and tangent. Then there are their reciprocals and inverses.
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.
It is a number - in trigonometry or elsewhere.
how can trigonometry use in metallurgy
Trigonometry is used effectively in electronics.