有谁知道特殊三角形的三角函数值,即正弦,余弦,正切,余切.直角三角形和六十度,四十五度等

sin0=cos90=0
sin30=cos60=1/2
sin45=cos45=二分之根号二
sin60=cos30=二分之根号三
tan0=0
tan30=三分之根号三
tan45=1
tan60=根号三
tan90 不存在，ctanA=tan(90-A)

sin 0° = 0
cos 0° = 1
tan 0° = 0
cot 0° 不存在
sin 30° = 1/2
cos 30° = √3/2
tan 30° = √3/3
cot 30° = √3
sin 45° = √2/2
cos 45° = √2/2
tan 45° = 1
cot 45° = 1
sin 60° = √3/2
cos 60° = 1/2
tan 60° = √3
cot 60° = √3/3
sin 90° = 1
cos 90° = 0
tan 90° = 不存在
cot 90° = 0

sin 0° = 0cos 0° = 1tan 0° = 0cot 0° = + ∞sin 30° = 1/2cos 30° = √3/2tan 30° = √3/3cot 30° = √3sin 45° = √2/2cos 45° = √2/2tan 45° = 1cot 45° = 1sin 60° = √3/2cos 60° = 1/2tan 60...

sin 30° = 1/2
cos 30° = √3/2
tan 30° = √3/3
cot 30° = √3
sin 45° = √2/2
cos 45° = √2/2
tan 45° = 1
cot 45° = 1
sin 60° = √3/2
cos 60° = 1/2
tan 60° = √3
cot 60° = √3/3