Respuesta :

SOLUTION

Using Pythagorean theorem, it follows

[tex]\begin{gathered} x^2+12^2=13^2 \\ x^2=13^2-12^2 \\ x^2=169-144 \\ x^2=25 \\ x=5 \end{gathered}[/tex]

Using the cosine rule it follows:

[tex]\cos\theta=\frac{5}{13}[/tex]

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