OpenStax, Algebra and Trigonometry 2e §7.3 Unit Circle · Example 2 · Trigonometry · Unit circle

Finding a Cosine from a Sine or a Sine from a Cosine

If $s in (t) = \frac{3}{7}$ and $t$ is in the second quadrant, find $cos (t) .$

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OpenStax, Algebra and Trigonometry 2e · §7.3 Unit Circle · Example 2

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