cos(-315°),tan8π/3等于多少

问题描述:

cos(-315°),tan8π/3等于多少

cos(-315)=cos(360-315)=cos45=0.707
tan8π/3=tan120=-tan60=-1.732

cos(-315°)=cos45°=2分之根号2
tan8π/3=tan120 =负根号3