maths trig

Card Set Information

Author:
ghoran
ID:
287867
Filename:
maths trig
Updated:
2014-11-02 13:34:58
Tags:
trig
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Description:
revision
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  1. sec x =
    1/cos x
  2. cosec x =
    1/sin x
  3. cot x =
    • 1/tan x
    • cos x/sin x
  4. tan (2x)
    2tanx/1-tan2x
  5. Rsin(x +- θ)
    asin x +- bcosx
  6. Rcos(x +- θ)
    acos x -+ bsin x
  7. R
    √a2+b2
  8. θ =
    tan-1 b/a
  9. tan x
    sin x/cos x
  10. cos2x + sin2x =
    1
  11. 1 + tan2x =
    sec2x
  12. 1 + cot2x
    cosec2x
  13. sin (2a)
    2sinacosa
  14. cos (2a)
    • cos2a - sin2
    • 1 - 2sin2
    • 2cos2a - 1
  15. acute sine
    positive
  16. obtuse sine
    positive
  17. acute cosine
    positive
  18. obtuse cosine
    negative
  19. obtuse tan
    negative

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