Question

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Answer 1

Respuesta:

$A) \: \: \: \frac{\sqrt{21}}{5}$

Explicación paso a paso:

$Sen^2 \beta + Cos^2 \beta = 1$

$Sen^2 \beta +( \frac{2}{5} )^2 = 1$

$Sen^2 \beta + \frac{4}{25} = \frac{25}{25}$

$Sen^2 \beta = \frac{25}{25}- \frac{4}{25}$

$Sen^2 \beta = \frac{21}{25}$

$Sen \beta = \frac{\sqrt{21}}{\sqrt{25}}$

$Sen \beta = \frac{\sqrt{21}}{5}$