2010014904

SubArea: 
Trigonometric equations and inequalities
Level: 
B
Project ID: 
2010014904
Source Problem: 
9000046506
Accepted: 
0
Clonable: 
1
Easy: 
1
Identify the optimal first step convenient to solve the following trigonometric equation. Do not consider the step which is possible but does not help to solve the equation. 3cos2⁡x=2sin⁡xcos⁡x
cos⁡x(3cos⁡x−2sin⁡x)=0
3cos⁡x=2sin⁡x
3(1−sin2⁡x)=2sin⁡xcos⁡x
3cos2⁡x2sin⁡xcos⁡x=1