Q. 43.7( 35 Votes )

Is it right to say cos(60° + 30°) = cos 60° cos 30° - sin 60° sin 30°.

Answer :

Let us solve Left-Hand-Side:

cos (60° + 30°) = cos 90°


cos (60° + 30°) = 0 [, cos 90° = 0]


Now, solve for Right-Hand-Side:




cos 60° cos 30° - sin 60° sin 30° = 0


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Trick to learn all Trigonometric Formulae28 mins
Champ Quiz | Trigger on Trigonometry47 mins
Champ Quiz | Trigonometry Important Questions33 mins
NCERT | Trigonometric Identities52 mins
Champ Quiz | NTSE Trigonometry50 mins
Testing the T- Ratios of Specified Angles57 mins
Foundation | Cracking Previous Year IMO QuestionsFREE Class
NCERT | Imp. Qs. on Trigonometry42 mins
Quiz | Trail of Mixed Questions on Trigonometry59 mins
Quiz | Imp. Qs. on Trigonometry41 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
view all courses