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Trig Identities

  1. sin2x + cos2x =
    1
  2. 1 + tan2x =
    sec2x
  3. 1 + cot2x =
    csc2x
  4. 2sinxcosx
    sin(2x)
  5. cos2x-sin2x
    2cos2x-1
    1-sin2x
    Cos(2x)
  6. 2tanx
    1-tan2x
    tan(2x)
  7. + (1/2 (1+cosx))1/2
    -
    • cos x
    • 2
  8. + (1/2(1+cosx))1/2
    -
    sin x/2
  9. 1-cosx/sinx

    sin x/1+cosx
    tan x/2
  10. sinxcosy+cosxsiny
    sin (x+y)
  11. sinxcosy-cosxsiny
    sin(x-y)
  12. cosxcosy-sinxsiny
    cos (x+y)
  13. cosxcosy+sinxsiny
    cos(x-y)
  14. tanx+tany
    1-tanxtany
    tan(x+y)
  15. tanx-tany
    1+tanxtany
    tan(x-y)
  16. sin(-x)
    -sinx
  17. cos(-x)
    cosx
  18. tan(-x)
    -tanx
  19. csc(-x)
    -cscx
  20. sec(-x)
    secx
  21. cot(-x)
    -cotx
Author
lynn.padlipsky
ID
100655
Card Set
Trig Identities
Description
Pythagoreon, Double Angle, Half-Angle, Sum/Diff, and Negative Identity
Updated

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