47π π π 1 - =sin -8π+ =sin = ; 解:(1)sin 6 6 6 2 π 17π π 2 4π+ =cos = (2)cos =cos ; 4 4 4 2 17π π - =tan -6π+ =tan 3 3
(3)tan
π = 3. 3
返回
47π π π 1 - =sin -8π+ =sin = ; 解:(1)sin 6 6 6 2 π 17π π 2 4π+ =cos = (2)cos =cos ; 4 4 4 2 17π π - =tan -6π+ =tan 3 3
(3)tan
π = 3. 3
返回