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

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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

$\theta$=30°

$\theta$=120°

$\theta$=225°

$\theta$=300°

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