Cos@= adjacent edge/hypotenuse

Tan@= opposite/adjacent edge

Cot@= adjacent edge/opposite edge

A, the degree of evil formula

1、sin 30= 1/2

2, sin 45= root number 2/2

3.sin 60= root number 3/2

Second, cos degree formula

1, cos 30= root number 3/2

2, cos 45= root number 2/2

3、cos 60= 1/2

Three. Sunlight formula

1, tan 30= root number 3/3

2. Tan 45= 1

3, tan 60= root number 3

Extended data:

sin0=sin0 =0

cos0=cos0 = 1

tan 0 = tan 0 = 0 sin 15 = 0.650；

sin 15 =0.259

cos 15 =-0.759； cos 15 =0.966

tan 15 =-0.855； tan 15 =0.268

sin30 = 1/2

cos30 = 0.866

Baidu encyclopedia-trigonometric function value