Mnemonic Device
- Two Old Angels Skipped Over Heaven, Carrying Ancient Harps
Explanation
the equations for Tangent, Sine, and Cosine.
- O stands for opposite, A stands for adjacent, and H stands for hypotenuse.
- Tangent = Opposite/Adjacent (Two Old Angels)
- Sine = Opposite/Hypotenuse (Skipped Over Heaven)
- Cosine = Adjacent/Hypotenuse (Carrying Ancient Harps)
Variation
- Two Old Aunts, Sitting On Horseback, Catching A Husband. Any Old Time, Husbands Are Caught, Hail Or Shine.
- Tangent = Opposite/Adjacent (Two Old Aunts) Sine = Opposite/Hypotenuse (Sitting On Horseback) Cosine = Adjacent/Hypotenuse (Catching A Husband)
- Inverse functions:
- Cosine = Adjacent/Hypotenuse (Husbands Are Caught)
- Tangent = Opposite/Adjacent (Any Old Time)
- Sine = Opposite/Hypotenuse (Hail Or Shine)
Additional Note
The inverse-functions part of this variation could use a clearer explanation — if you can help, let us know.