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caothuyt2

pt<=>[tex]2.\sqrt{3}.cos^2x +\sqrt{3}.cosx - 2.\sqrt{3}+ 3sinx- 2sinx.cosx=0[/tex]
<=>[tex]2.\sqrt{3}.(1-sin^2x) +\sqrt{3}.cosx - 2.\sqrt{3}+ 3sinx- 2sinx.cosx=0[/tex]
<=>[tex]2.\sqrt{3} - 2.\sqrt{3}.sin^2x +\sqrt{3}.cosx - 2.\sqrt{3}+ 3sinx- 2sinx.cosx=0[/tex]
<=>[tex]\sqrt{3}.sinx.(\sqrt{3}-2sinx) + cosx(\sqrt{3} -2sinx)[/tex]
<=>[tex](\sqrt{3}- 2sinx)(\sqrt{3}sinx + cosx)=0[/tex]
... Đến đây thôi nhá ..hii..
 
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