toán 11

D

dien0709

$\sqrt{3}cos2x(2sinx-1)+2cosx(2sin^2x+1)=3sin2x$

$\iff \sqrt{3}cos2x(2sinx-1)+2cosx(sinx-1)(2sinx-1)=0$

$\iff \bigstar 2sinx-1=0$

$\bigstar cos(2x-\dfrac{\pi}{3})-cosx=0$
 
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