tanβ=√2 而β∈(0,π/2)所以sinβ=√6/3
cosγ=3/4而γ∈(0,π/2)所以sinγ=√7/4
因为sinα=1/3,sinβ=√6/3,sinγ=√7/4
√6/3＞√7/4＞1/3,α,β,γ∈(0,π/2)所以β＞γ＞α