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Trig identities

  1. Pythagorean identity (using sin and cos)
    sin2(Θ)+cos2(Θ)=1
  2. Pythagorean identity (using tan and sec)
    1+ tan2(Θ) = sec2(Θ)

    sec2(Θ)-tan2(Θ) = 1
  3. Pythagorean identity (using cot and csc)
    1 + cot2(Θ) = csc2(Θ)

    csc2(Θ)-cot2(Θ) = 1
  4. Tangent Identity
    tanΘ=
    • =  sinΘ
    •     cosΘ
  5. Cotangent Identity
    cotΘ=
    • = cosΘ
    •    sinΘ
  6. sin(2Θ)=
    =2sin(Θ)cos(Θ)
  7. cos(2Θ)=
    • =cos2(Θ)-sin2(Θ)
    • =2cos2(Θ)-1
    • =1-2sin2(Θ)
  8. tan(2Θ)=
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Author
saucyocelot
ID
358578
Card Set
Trig identities
Description
Review of trigonometric identities
Updated

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