sin 0° =0cos 0° =1tan 0° =0cot 0°不存在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° =√3cot 60°...