来自尚丙兰的问题
【高考三角函数已知cos(5π/12+α)=1/3,-π<α<-π/2,则cos(π/12-α)=?已知cos(5π/12+α)=1/3,-π<α<-π/2,则cos(π/12-α)=?(-2根号2/3)cos(π/12-α)=sin(5π/12+α)导出都会就是想问下最后答案为什么】
高考三角函数已知cos(5π/12+α)=1/3,-π<α<-π/2,则cos(π/12-α)=?
已知cos(5π/12+α)=1/3,-π<α<-π/2,则cos(π/12-α)=?
(-2根号2/3)
cos(π/12-α)=sin(5π/12+α)
导出都会就是想问下最后答案为什么有符号怎么看范围
1回答
2019-07-22 04:22