若0
来源：学生作业帮助网 编辑：六六作业网 时间：2024/08/30 11:13:35
若0若0若0∵α为锐角∴cosα=4/5tanα=3/4sin(α+π/6)=sinαcos(π/6)+cosαsinπ/6=√3/2sinα+1/2cosα=（3√3+4）/10cos(π/3+α)
若0
若0
若0
∵α为锐角
∴cosα=4/5tanα=3/4
sin(α+π/6)=sinαcos(π/6)+cosαsinπ/6
=√3 /2sinα+1/2cosα
=（3√3+4）/10
cos(π/3+α)=cosαcos(π/3)-sinαsin(π/3)
=1/2cosα-√3 /2sinα
=(4-3√3)/10
tan(α+π/4)=(tanα+tanπ/4)/(1-tanαtanπ/4)
=(7/4)/(1/4)
=7