toan 11

N

nguyenbahiep1

[TEX]1 -(2 +\sqrt{2}).sinx + \frac{2.\sqrt{2}}{1 + cot^2 x} = 0 \\ 1 -(2 +\sqrt{2}).sinx + (2.\sqrt{2}).cos^2 x = 0\\ 1 -(2 +\sqrt{2}).sinx + (2.\sqrt{2}).(1 -sin^2 x) = 0 \\ 2.\sqrt{2}.sin^2 x + ( 2+\sqrt{2}).sinx -(1 + 2.\sqrt{2}) = 0 [/TEX]
 
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