若α,β为锐角且cosα=3/5,tan(α-β)=-1/3,则tanβA.1/3 B.3 C.9/13 D.13/9
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![若α,β为锐角且cosα=3/5,tan(α-β)=-1/3,则tanβA.1/3 B.3 C.9/13 D.13/9](/uploads/image/z/6994766-38-6.jpg?t=%E8%8B%A5%CE%B1%2C%CE%B2%E4%B8%BA%E9%94%90%E8%A7%92%E4%B8%94cos%CE%B1%3D3%2F5%2Ctan%28%CE%B1-%CE%B2%29%3D-1%2F3%2C%E5%88%99tan%CE%B2A.1%2F3++++++++B.3++++++++++C.9%2F13++++++++++D.13%2F9)
若α,β为锐角且cosα=3/5,tan(α-β)=-1/3,则tanβA.1/3 B.3 C.9/13 D.13/9
若α,β为锐角且cosα=3/5,tan(α-β)=-1/3,则tanβ
A.1/3 B.3 C.9/13 D.13/9
若α,β为锐角且cosα=3/5,tan(α-β)=-1/3,则tanβA.1/3 B.3 C.9/13 D.13/9
B
tanB=tan(a-(a-B))