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The word Trigonometry was derived from two Green words “Trigonon” and “Metron”, and the meanings of them are “Triangle” and “Measure” respectively. Therefore, the meaning of trigonometry is measuring a triangle. A triangle contains angles and sides basically. So, measuring angles, sides and investigating relation between them is called Trigonometry.
There are six functions in trigonometry and each trigonometric function is defined on the basis of ratio between any two sides of the triangle. Hence, every function is also called as trigonometric ratio simply.
List of all formulas, used in trigonometry.
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