Tìm MIN, MAX biểu thức lượng giác

C

conga222222

$\eqalign{
& A = {\sin ^2}x - \sqrt 3 \sin x\cos x + 2{\cos ^2}x \cr
& = 1 - \frac{{\sqrt 3 \sin 2x}}{2} + \frac{{1 + \cos 2x}}{2} \cr
& = \frac{3}{2} + \cos \left( {2x + \frac{\pi }{3}} \right) \cr
& \to ... \cr} $
 
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