根号3×cosπ/12-sinπ/12=?
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/24 08:38:44
![根号3×cosπ/12-sinπ/12=?](/uploads/image/z/6867410-50-0.jpg?t=%E6%A0%B9%E5%8F%B73%C3%97cos%CF%80%EF%BC%8F12%EF%BC%8Dsin%CF%80%EF%BC%8F12%3D%3F)
根号3×cosπ/12-sinπ/12=?
根号3×cosπ/12-sinπ/12=?
根号3×cosπ/12-sinπ/12=?
根号3×cosπ/12-sinπ/12=2(根号三/2cosπ/12-1/2sinπ/12)
=2(sinπ/3cosπ/12-cosπ/3sinπ/12)
=2sin(π/3-π/12)= 根号2
=V(3+1)(V3/2 Cos pi/12 - 1/2 sin Pi/12)
=2Sin( pi/3 - pi/12)
=2Sin(pi/4)
=V2