Maths D

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Author:
Anonymous
ID:
117175
Filename:
Maths D
Updated:
2011-11-15 23:34:41
Tags:
cos sin
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Description:
Sin Cos Tan Rules
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  1. Sin2 + Cos2 =
    Sin2 + Cos2 = 1
  2. Sin (A+/-B) =
    Sin (A+/-B) = Sin A.Cos B +/- Cos A.Sin B
  3. Cos (A +/- B) =
    Cos (A +/- B) = Cos A.Cos B -/+ Sin A.Sin B
  4. Tan (A +/- B) =
    • Tan (A +/- B) = Tan A +/- Tan B
    • ........................1 -/+ Tan A.Tan B
  5. Sin 2A =
    Sin 2A = 2.Sin A.Cos B
  6. Cos 2A =
    • Cos 2A =
    • - Cos2 A - Sin2 A
    • - 2.Cos2 A - 1
    • - 1 - 2.Sin2 A
  7. Tan 2A =
    • Tan 2A = 2.Tan A
    • ..............1 - Tan2 A
  8. 2.Sin A.Cos B =
    2.Sin A.Cos B = Sin (A + B) + Sin (A - B)
  9. 2.Cos A.Cos B =
    2.Cos A.Cos B = Cos (A + B) + Cos (A - B)
  10. 2.Sin A.Sin B =
    2.Sin A.Sin B = Cos (A - B) - Cos (A + B)
  11. Sin A +/- Sin B =
    Sin A +/- Sin B = 2.Sin.1/2.(A +/- B).Cos.1/2.(A -/+ B)
  12. Cos A + Cos B =
    Cos A + Cos B = 2.Cos.1/2.(A + B).Cos.1/2.(A - B)
  13. Cos A - Cos B =
    Cos A - Cos B = -2.Sin.1/2.(A + B).Sin.1/2.(A - B)

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