# Find the exact value of trigonometric ratios

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##### Examples
###### Lessons
1. Find the exact value of all six trigonometric ratios, then make a conclusion
which primary trigonometric ratios (sin $\theta , cos \theta, tan \theta$) are positive in each
1. $\theta$=30°
2. $\theta$=120°
3. $\theta$=225°
4. $\theta$=300°