TRIG IDENTITIES

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Author:
Anonymous
ID:
105496
Filename:
TRIG IDENTITIES
Updated:
2011-09-30 20:37:08
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TRIG IDENTITIES David
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TRIG IDENTITIES
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  1. sin2x + cos2x =
    1
  2. sin 2x =
    2 sin x cos x
  3. cos 2x =
    cos2 x − sin2 x
  4. sin2 x =
    1/2 (1 − cos 2x)
  5. cos2 x =
    1/2 (1 + cos 2x)
  6. sinAcosB =
    1/2 [sin (A B) + sin(A + B)]
  7. sinAsinB =
    1/2 [cos(A B)−cos(A + B)]
  8. cosAcosB =
    1/2 [cos(A B)+cos(A + B)]
  9. sin2 x =
    1 − cos2 x
  10. sec2 x =
    1 + tan2 x
  11. csc2 x =
    1 + cot2 x
  12. cos2 x =
    1 − sin2 x
  13. tan2 x =
    sec2 x − 1
  14. cot2 x =
    csc2 x − 1

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