September 2019 1 34 Report
En un triángulo ABC, recto en A, se cumple que :

 \frac{1}{ {b}^{2} } - \frac{1}{ {c}^{2} } = \frac{1}{ {a}^{2} }

Calcule :

 \tan {}^{2} ( \beta ) + 4

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