If α∈(0,π2) then √x2+x+tan2 α√x2+x is always greater than or equal to
(a) √x2+x+tan2 α√x2+x≥2 tan α (A.M≤G.M).
If α ϵ(0,π2), then √x2+x+tan2 α√x2+x is always greater than or equal to