常见的三角函数sin、cos、tan、cot 30°、45°、60°、90°的值分别是多少

sin 30° = 0.5 cos 30° = √3/2 tan 30° = 1/√3 cot 30° = √3

sin 45° = cos 45° = 1/√2 tan 45° = 1 cot 45° = 1

sin 60° = √3/2 cos 60° = 0.5 tan 60° = √3 cot 60° = 1/√3

sin 90° = 1 cos 90° = 0 tan 90° = undefined cot 90° = 0