π/2

来源：学生作业帮助网编辑：作业帮时间：2024/05/03 07:43:12

π/2
π/2

π/2
tan(A+B)=tanA+tanB/1-tanAtanB=-1/2 tan(2A+B)=tan(A+A+B)=tanA+tan(A+B)/1-tanAtan(A+B)=-1 因为π/2

2kπ+π π/2 π/2 -π/2 π/2 -π/2 -π/2 π/2 π/2 π/2 π/2 2/π π/2 kπ-2π/3 已知π+2Kπ Sin(π+π/6)Sin(2π+π/6)Sin(3π+π/6).Sin(2008π+π/6)求值设2kπ+π/2 为什么=2Kπ+π/2