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Grade: 11
        
Find the principal solution of sin theta = sin2 theta
3 months ago

Answers : (2)

Saurabh Koranglekar
askIITians Faculty
3157 Points
							Dear student

Expand rhs as 2 sin( theta) cos ( theta)

Now eqn is cos(theta) = 1/2

Or sin (theta ) = 0

Principal solutions 0, 60, 180, 300, 360

Regards
3 months ago
Arun
22809 Points
							
 
Dear student
 
sin x = sin 2x
 
sin x = 2 sin x cos x
 
sin x ( 1 – 2 cos x) = 0
 
sin x = 0
or cos x = ½
 
hence x = 0, pi
or x = 330
3 months ago
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