[Toán 10] lượng giác

H

hn3

[TEX]<=>\sqrt{3}(2cos^2x+cosx-2)+(3-2cosx)sinx=0[/TEX]

[TEX]<=> 2\sqrt{3}sin^2x-3sinx+2sinxcosx-\sqrt{3}cosx=0[/TEX]

[TEX]<=> (2sinx-\sqrt{3})(\sqrt{3}sinx+cosx)=0[/TEX]

Dễ rồi ;)
 
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