Signs in each quadrant: "ASTC"
A standard method from Trigonometry (2-D): the steps.
Steps
| Quadrant | Angle | Positive |
|---|---|---|
| I | 0°–90° | All |
| II | 90°–180° | Sin |
| III | 180°–270° | Tan |
| IV | 270°–360° | Cos |
For the whole topic, read Trigonometry (2-D): key points, common mistakes and how the DSE tests it.