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SUBMITTED BY: SOLLYM

DATE: March 23, 2016, 3:35 p.m.

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  1. code x
  2. sinax cosbx = 1/2 [sin(a-b)x + sin(a+b)x]
  3. cosax cosbx = 1/2 [cos(a-b)x + cos(a+b)x]
  4. sinax sinbx = 1/2 [cos(a-b)x - cos(a+b)x]
  5. sin2x = 1/2 [1 – cos(2x)]
  6. cos2x = 1/2 [1 + cos(2x)]
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