设α∈（0,π/3) β∈（π/6,π/2) 且5/3sinα+5cosα=8 ,/2sinβ+/6cosβ =2 求cos（α+β ）设α∈（0,π/3) β∈（π/6,π/2) 且5/3sinα+5cosα=8 ,/2sinβ+/6cosβ =2 求cos（α+β ）的值且5√3sinα+5cosα=8 ,√2sinβ+√6cosβ =2看

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设α∈（0,π/3) β∈（π/6,π/2) 且5/3sinα+5cosα=8 ,/2sinβ+/6cosβ =2 求cos（α+β ）设α∈（0,π/3) β∈（π/6,π/2) 且5/3sinα+5cosα=8 ,/2sinβ+/6cosβ =2 求cos（α+β ）的值且5√3sinα+5cosα=8 ,√2sinβ+√6cosβ =2看
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设α∈（0,π/3) β∈（π/6,π/2) 且5/3sinα+5cosα=8 ,/2sinβ+/6cosβ =2 求cos（α+β ）设α∈（0,π/3) β∈（π/6,π/2) 且5/3sinα+5cosα=8 ,/2sinβ+/6cosβ =2 求cos（α+β ）的值且5√3sinα+5cosα=8 ,√2sinβ+√6cosβ =2看
设α∈（0,π/3) β∈（π/6,π/2) 且5/3sinα+5cosα=8 ,/2sinβ+/6cosβ =2 求cos（α+β ）
设α∈（0,π/3) β∈（π/6,π/2) 且5/3sinα+5cosα=8 ,/2sinβ+/6cosβ =2 求cos（α+β ）的值
且5√3sinα+5cosα=8 ,√2sinβ+√6cosβ =2
看清楚,是根号哈,我弄错了

设α∈（0,π/3) β∈（π/6,π/2) 且5/3sinα+5cosα=8 ,/2sinβ+/6cosβ =2 求cos（α+β ）设α∈（0,π/3) β∈（π/6,π/2) 且5/3sinα+5cosα=8 ,/2sinβ+/6cosβ =2 求cos（α+β ）的值且5√3sinα+5cosα=8 ,√2sinβ+√6cosβ =2看
5/3sinα+5cosα=10sin(α+π/6)=8
sin(α+π/6)=0.8; cos(α+π/6)=0.6
同理2sin（β+π/3）=/2 ;
2cos（β+π/3）=-/2
sin(α+β+π/2)=-0.1*/2
cos（α+β ）=-0.1*/2

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