Q. 9 A55.0( 4 Votes )

If 2 cos 3 θ = 1, then the value of θ is
A. 10o

B. 15o

C. 20o

D. 30o

Answer :

Given,


we know


θ = 20


cos3(20) = cos60


Option A is incorrect as it does not satisfy the value


Option B is incorrect as it does not satisfy the value


Option D is incorrect as it does not satisfy the value

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Trigonometric IdentitiesTrigonometric IdentitiesTrigonometric Identities33 mins
Basic Concepts of TrigonometryBasic Concepts of TrigonometryBasic Concepts of Trigonometry45 mins
Champ Quiz | Trigonometric IdentitiesChamp Quiz | Trigonometric IdentitiesChamp Quiz | Trigonometric Identities33 mins
Smart Revision | Trigonometric IdentitiesSmart Revision | Trigonometric IdentitiesSmart Revision | Trigonometric Identities40 mins
Quiz | Task on Trigonometric RatiosQuiz | Task on Trigonometric RatiosQuiz | Task on Trigonometric Ratios46 mins
Applying the Trigonometric IdentitiesApplying the Trigonometric IdentitiesApplying the Trigonometric Identities52 mins
Smart Revision | Trigonometric RatiosSmart Revision | Trigonometric RatiosSmart Revision | Trigonometric Ratios41 mins
NCERT | Trigonometric IdentitiesNCERT | Trigonometric IdentitiesNCERT | Trigonometric Identities52 mins
NCERT I Trigonometric RatiosNCERT I Trigonometric RatiosNCERT I Trigonometric Ratios50 mins
Trigonometric IdentitiesTrigonometric IdentitiesTrigonometric Identities44 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses