Question

references for trignometry​

Answer 1

Answer:

Step-by-step explanation:

I think trigonometry is a geometry about triangles

Answer 2

Principal Trig Relationships

sin ⁡ ( x ) = cos ⁡ ( π 2 − x ) {\displaystyle \sin(x)=\cos \left({\frac {\pi }{2}}-x\right)}

cos ⁡ ( x ) = sin ⁡ ( π 2 − x ) {\displaystyle \cos(x)=\sin \left({\frac {\pi }{2}}-x\right)}

tan ⁡ ( x ) = sin ⁡ ( x ) cos ⁡ ( x ) {\displaystyle \tan(x)={\frac {\sin(x)}{\cos(x)}}}