GPT: $2sinx+4cosx+cos(2x)=5$
#2
Posted 07-01-2017 - 23:17
Nguyen Duy Q
-
- Thành viên mới
-
- 10 posts
Binh nhì
GPT: $2sinx+4cosx+cos(2x)=5$
$2sinx+4cosx+cos(2x)=5$
$\Leftrightarrow 2sin^{2}x-2sinx=4cosx-4$
$\Leftrightarrow sinx(sinx-1)=2(cosx-1)$
pt co nghiem khi $sinx=0$ va $cosx=1$
Edited by phamngochung9a, 29-01-2017 - 19:44.
1 user(s) are reading this topic
0 members, 1 guests, 0 anonymous users
