In triangle XYZ, we have angle X = 90 and tan Z = \(2\). What is cos Z?
What is cos Z?
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\(z:y=2:1\\ x:y:z=\sqrt{5}:1:2\\ \color{blue}cos\ z=\frac{1}{\sqrt{5}}=\frac{1}{5}\cdot \sqrt{5}\)
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