9000046508

SubArea: 
Trigonometric equations and inequalities
Level: 
C
Project ID: 
9000046508
Accepted: 
1
Clonable: 
0
Easy: 
0
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. 3sin⁡x=2−cos⁡x
3sin2⁡x=4−4cos⁡x+cos2⁡x
substitution 2−cos⁡x=z
3sin2⁡x=4−cos2⁡x
3sin2⁡x=1−2cos⁡x+cos2⁡x