【简答题】已知 tgθ= 2 ,求 cosθ-sinθ cosθ+sinθ 的值.
【单选题】已知x∈ ,cosx= ,则tg2x= [ ]
【简答题】Match the company terms with their definitions
【单选题】Lack of money led the company to a situation _____ they had to decide whether they should keep on with their production.
【简答题】在△ABC中,已知A、B、C成等差数列,求tg( A 2 )+ 3 tg( A 2 )tg( C 2 )+tg( C 2 )的值.