fxx3x2tan的精选

问题详情：设函数f(x)=x3+x2+tanθ,其中θ∈,则导数f′(1)的取值范围是()A.[-2,2]               B.[,]C.[,2]              D.[,2]【回答】D.由已知f′(x)=sinθ·x2+cosθ·x,所以f′(1...