sin(-5π/3)= 求值 用三角函数的诱导公式

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/06 16:26:31

sin(-5π/3)= 求值 用三角函数的诱导公式
sin(-5π/3)= 求值 用三角函数的诱导公式

sin(-5π/3)= 求值 用三角函数的诱导公式
sin(-5π/3)
=-sin(5π/3)
=-sin(π+2π/3)
=-(sinπcos2π/3+cosπsin2π/3)
=-(-sin2π/3)
=sin2π/3
=√3/2

sin(-5π/3)= sin(-2π+π/3)= sin(π/3)= √3/2

sin(-5π/3)
=-sin(5π/3)
=-sin(π+2π/3)
=-(sinπcos2π/3+cosπsin2π/3)
=-(-sin2π/3)
=sin2π/3
=√3/2