$4cot^{6}x+3\left ( 1-\frac{cos2x}{sin^{2}x} \right )^{4}=7$
Edited by hothithuy htt, 31-12-2017 - 15:46.
giải phương trình $4cot^{6}x+3\left ( 1-\frac{cos2x}{sin^{2}x} \right )^{4}=7$
Started By hothithuy htt, 31-12-2017 - 15:45
1 user(s) are reading this topic
0 members, 1 guests, 0 anonymous users
