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Nishtha Garg Grade:
        

Hi,


What is the derivation of formula for sum of sine/cosine series, the angles of which are in A.P.?


Thanks,


Nishtha

7 years ago

Answers : (2)

SAGAR SINGH - IIT DELHI
879 Points
										

 


Dear nishtha,


sin ( π + θ ) = –sinθ and sin (2π + θ ) = sinθ


                                       ...  –sin (α + β) = sin(π +  )


... trigonometric-series


  so on. Using these results, required sum is


  S=sin α+ trigonometric-series… to n terms


    = sin α + sin trigonometric-series... to n terms trigonometric-series






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Sagar Singh


B.Tech IIT Delhi





7 years ago
sumesh
12 Points
										
if x1, x2, x3......xn in AP then prove that
secx1.secx2 + secx2.secx3 + secx3.secx4................................secxn-1.secxn = (tanxn-tanx1)/sin(x2-x1)
3 years ago
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