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Trigonometric ID's
Fundamental Trigonometric Identities
| Question | Answer |
|---|---|
| csc θ | 1/sin θ |
| sec θ | 1/cos θ |
| cot θ | 1/tan θ |
| tan θ | sin θ/cos θ |
| cot θ | cos θ/sin θ |
| sin² θ + cos² θ | 1 |
| 1 + tan² θ | sec² θ |
| 1 + cot² θ | csc² θ |
| sin(π/2 - θ) | cos θ |
| tan(π/2 - θ) | cot θ |
| sec(π/2 - θ) | csc θ |
| sin(-θ) | -sin θ |
| cos(-θ) | cos θ |
| tan(-θ) | -tan θ |
| cos(u ± v) | cos u cos v ± sin u sin v |
| sin(u ± v) | sin u cos v ± sin v cos u |