ACT 2014 December(72G) Math Question 17 Explanation - ACT Helper

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2014 December(72G) Math Question 17
Trigonometry
- Pythagorean Theorem & sin cos tan
Choice A
$\tan α = \frac{\sin α}{\cos α}$ $\Rightarrow \cos α = \frac{\sin α}{\tan α} = \frac{\frac{112}{113}}{\frac{112}{15}} = \frac{15}{113}$
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