[toán 11]pt lượng giác.

N

nguyenbahiep1

[TEX]cos^2x- \sqrt{3}.sin2x=1+sin^2x \\ cos^2x -sin^2x - \sqrt{3}.sin2x = 1 \\ cos2x - \sqrt{3}.sin2x = 1 \\ 2.cos ( 2x + \frac{\pi}{3}) = 1 \\ [/TEX]
 
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