can chi dễ mà .hihi.
$$2\tan(2x)+\sin(2x - \frac{3\pi}{2})+ \frac{2(\sin x +\cos x )}{\sin x - \cos x}=1$$
.............................hihi. lam đi nha !
$$2\tan(2x)+\sin(2x - \frac{3\pi}{2})+ \frac{2(\sin x +\cos x )}{\sin x - \cos x}=1$$
.............................hihi. lam đi nha !