**Mnemonic Device:**

- CAST

**Explanation:** to remember the CAST Rule for trigonometric functions. Go counterclockwise, starting from the bottom right quadrant of graph axes.

- C is the area where the angle is positive for Cosine.
- A is the area where the angle is positive for all trigonometric functions.
- S is the area where the angle is positive for Sine.
- T is the area where the angle is positive for Tangent.

**Additional Note:** Always measure from the x-axis to the angle line.

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