P
phuong95_online


tìm min,max 1,[TEX]y=sqrt(cos^2x-2cosx+5)+sqrt(cos^2x+4cosx+8)[/TEX]
2, [TEX]y = \frac{1}{{3 - 2\sin ^2 x}} + c{\rm{os}}2x[/TEX] 2,
2, [TEX]y = \frac{1}{{3 - 2\sin ^2 x}} + c{\rm{os}}2x[/TEX] 2,