K
kemdau_minhminh
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
giải phương trình sau:
sinx +cosx .(1-sin2x) =1-tanx
cosx
(1-tanx) (1+sin2x)= 1+tanx
3-tanx .(tanx+ 2 sinx) +6 cosx =0
sin2x + 2cos2x = 1+sinx-4cosx
sin2x +2cos2x =cosx-2+2sinxcos^2 x
sinx +cosx .(1-sin2x) =1-tanx
cosx
(1-tanx) (1+sin2x)= 1+tanx
3-tanx .(tanx+ 2 sinx) +6 cosx =0
sin2x + 2cos2x = 1+sinx-4cosx
sin2x +2cos2x =cosx-2+2sinxcos^2 x