问题描述:
tan/cos/sin150度等于多少,怎么算
最佳答案:
tan150°
=tan(180°-30°)
=-tan30°
=-sin30°/cos30°
=(-1/2)/(√3/2)
=-1/2*2/√3
=-1/√3
=-√3/3
cos150°
=cos(180°-30°)
=-cos30°
=-√3/2
sin150°
=sin(180°-30°)
=sin30°
=1/2
tan/cos/sin150度等于多少,怎么算
问题描述:
tan/cos/sin150度等于多少,怎么算
tan150°
=tan(180°-30°)
=-tan30°
=-sin30°/cos30°
=(-1/2)/(√3/2)
=-1/2*2/√3
=-1/√3
=-√3/3
cos150°
=cos(180°-30°)
=-cos30°
=-√3/2
sin150°
=sin(180°-30°)
=sin30°
=1/2