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
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))