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Bub nguyen

Bub nguyen

Đăng ký: 04-02-2014
Offline Đăng nhập: 04-02-2014 - 20:40
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sin3x + (1-cosx).cos2x = (sinx + 2cosx).sin2x

04-02-2014 - 18:45

1.  $2sin(x + \frac{\pi}{4}).cos(x - \frac{\pi}{4}) + 2sin(x + \frac{\pi}{4}) + sinx + cosx + \sqrt{2} = 0$

 

2.  $\frac{2sin(2x + \frac{\pi}{3}) + 2sin(x + \frac{\pi}{3})-1}{2cosx - \sqrt{3}} =1$

 

3.  sin3x + (1-cosx).cos2x = (sinx + 2cosx).sin2x

 

4.  $16sinx.cos4x + 1 = \sqrt{3}(tanx + tan2x)+ tanx.tan2x$