# SOH CAH TOA

There are several good mnemonic devices for learning the ratios.

- Some Old HippieCaught Another HippieTripping On Acid
- Some Old Hag Cracked All Her Teeth On Apples
- Some Old Hags Cackle And Howl Till Old Age

Although there are six trigonometric ratios, three are simply the reciprocals of Sine, Cosine and Tangent. Therefore, if SOH CAH TOA is memorized, the other three ratios (Cosecant, Secant and Cotangent) can be derived by using the reciprocals.

Related Links:Math Trigonometry Standard Position of an Angle - Initial Side - Terminal Side |

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