$tanx+2tan2x+4cot4x=sin\frac{x}{2}+cos\frac{x}{2}$
giải phương trình $tanx+2tan2x+4cot4x=sin\frac{x}{2}+cos\frac{x}{2}$
Started By hothithuy htt, 31-12-2017 - 20:35
1 user(s) are reading this topic
0 members, 1 guests, 0 anonymous users
