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# Trig question

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In triangle XYZ, we have angle X = 90 and tan Z = $$2$$. What is cos Z?

May 5, 2022

#1
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What is cos Z?

Hello Guest!

$$z:y=2:1\\ x:y:z=\sqrt{5}:1:2\\ \color{blue}cos\ z=\frac{1}{\sqrt{5}}=\frac{1}{5}\cdot \sqrt{5}$$

!

May 5, 2022