Because it is a branch of mathematics that is concerned with measurements of angles and sides of triangles, and following from that, areas and other characteristics.
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No, it is a branch of mathematics.
Trigonometry is a whole branch of mathematics and does not comprise only one formula!
Centuries ago, Islam created the mathematics of 'Trigonometry'.
Students are taught trigonometry so they meet the needs in architecture, astronomy and in other fields because trigonometry is the branch of Maths and maths is being used everywhere.
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