Find the exact value of trigonometric ratios

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Now Playing:Find the exact value of trigonometric ratios – Example 1a

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
quadrant
1. $\theta$ =30°
2. $\theta$ =120°
3. $\theta$ =225°
4. $\theta$ =300°

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