Sum of Sines or Cosines of n Angles in A.P
Sum of Sines or Cosines of n Angles in A.P . Proof: Let S = sinα + sin(α + β) + sin(α + 2β) + . . . + sin( α + (n – 1)β) Here angles are in A.P and common difference of angles in β . multiplying both sides by 2sin(β/2), we get Read more about Sum of Sines or Cosines of n Angles in A.P[…]