Question

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Answer 1

Explicación paso a paso:

$\tan \: de \: tita( \frac{9}{12} ) + \tan \: de \: alfa( \frac{9}{12} ) \\ ( \frac{9}{12} + \frac{9}{12} ) ^{2} \\ ( \frac{18}{12} )^{2} \: \: simplificamos \: y \: queda \: \\ ( \frac{3}{2} ) ^{2} = \frac{9}{4 } = 2.25$