GTLN&NN: $\dfrac{3}{1 + tan^2x} + \dfrac{1}{1 + cot^2x} + \sqrt{3}sin2x + 2sin(x+\dfrac{pi}{6}) + 3$

D

dragontruong3

[TEX]\Leftrightarrow 2(sin(2x+pi/6)+sin(x+pi/6))+5[/TEX]
[TEX]\Leftrightarrow ...............[/TEX]
Chưa nghỉ ra!
 
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