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Please it would be grateful if any body could solve the following questions - Prove that sin(180/14) sin(3*180/14) sin(5*180/14) sin(7*180/14) =1/8 . If sin x + sin y = 3(cos y – cosx) , Prove that sin 3x + sin 3y=0 . Prove that tan 2 180/16 + tan 2 2*180/16 + tan 2 3*180/16 +..........+ tan 2 7*180/16 = 35 .

Please it would be grateful if any body could solve the following questions -
  1.  Prove that sin(180/14) sin(3*180/14) sin(5*180/14) sin(7*180/14) =1/8 .
  2. If sin x + sin y = 3(cos y – cosx) , Prove that                              sin 3x + sin 3y=0 .
  3. Prove that tan2180/16 + tan22*180/16 + tan23*180/16 +..........+ tan27*180/16  = 35 .

Grade:11

1 Answers

Saurabh Koranglekar
askIITians Faculty 10335 Points
4 years ago
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