[Toán 11] Phương trình lượng giác

N

nguyenbahiep1

[TEX]1 - cos(2x + \frac{\pi}{2}) = 1 - cos 2x - 2tan x \\ sin 2x = - cos2x - 2tan x \\ \frac{2tan x}{1+tan^2x} + \frac{1-tan^2x}{1+tan^2x} + 2tan x = 0 \\ 2tan x + 1 -tan^2x + 2tan x + 2tan^3x = 0 [/TEX]
 
You must log in or register to reply here.
Top Bottom