α、β∈(0,π)Cos(α+β)=3/5 ,sinβ=5/13 ,求sinα
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α、β∈(0,π)Cos(α+β)=3/5 ,sinβ=5/13 ,求sinα
α、β∈(0,π)Cos(α+β)=3/5 ,sinβ=5/13 ,求sinα
α、β∈(0,π)Cos(α+β)=3/5 ,sinβ=5/13 ,求sinα
α、β∈(0,π)
Sin(α+β)=4/5 cosβ=12/13
sinα = Sin[(α+β)-β]
= Sin(α+β)cosβ-Cos(α+β)sinβ
=4/5*12/13-3/5*5/13
=33/65