求值tan(kπ+π/6)cos(kπ-4π/3),k属于z
问题描述:
求值tan(kπ+π/6)cos(kπ-4π/3),k属于z
答
当k=2n时(n属于z),原式=tan(π/6)cos(-4π/3)=-√3/6;
当k=2n+1时(n属于z),原式=-tan(π/6)cos(-4π/3)=√3/6;