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Grade: 11 

                        
cosA+cos(A+B)+cos(A+2B)+cos(A+3B)+..........+cos(A+(n-1)B)=?
2 years ago

Answers : (1)

ayush pandey
31 Points 
							
Its an identity and it is equals to :(
cos(A+(n-1)B/2)×sin(nB/2) )÷sin (B÷2)
Although these questions are very rare at board level,they are useful in competetive exams and u need to practice it well to remember it at time of examination
2 years ago
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Course Features

  • 31 Video Lectures
  • Revision Notes
  • Test paper with Video Solution
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Previous Year Exam Questions


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