[Toán] PTLG

N

nguyenbahiep1

[laTEX]dk: sin x \not = \frac{\sqrt{2}}{2} \\ \\ 2(1 - 3(sinx.cosx)^2) -sin x.cosx = 0 \\ \\ -6u^2 -u +2 = 0 \\ \\ u = -\frac{2}{3} \Rightarrow sinx.cosx = -\frac{2}{3} \Rightarrow sin 2x = - \frac{4}{3} (L) \\ \\ u = \frac{1}{2} \Rightarrow sin 2 x = 1 [/laTEX]
 
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