ACT 2016 December(74H) Math Question 14 Explanation - ACT Helper

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2016 December(74H) Math Question 14
Trigonometry
- Pythagorean Theorem & sin cos tan
Choice H
We know that $s i n^{2} x + c o s^{2} x = 1$ $\Rightarrow c o s^{2} x = 1 - s i n^{2} x = 1 - \frac{4}{13} = \frac{9}{13}$
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