Answer of this question

Trigonometry is a branch of mathematics which deals with several ratios of lengths of sides of right-angled Triangle. 

There are six functions of an angle commonly
 used in trigonometry .

Their names are abbreviations are --

1. Sine (sin) 
2. Cosine (cos) 
3. Tangent  (tan)  
4. Cotangent (cot) 
5. Secant (sec) 
6. Cosecant (csc) 

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Written on July 24, 2021, 8:35 a.m.