**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)

- Tangent = Opposite/Adjacent (Two Old Aunts)

**Additional Note:** We are looking for additional information for the variation of this mnemonic (inverse functions). Do you have suggestions or corrections for this? If so, please submit a comment!

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