Question

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Answer 1

Respuesta:

           $4$     ;   la correcta es la Opción   E  )

Explicación paso a paso:

$Y = \sqrt{20Cos^{2}30 +1 }$

$Cos 30 = \frac{\sqrt{3} }{2}$

$Y = \sqrt{Cos^{2} 30+1 } = \sqrt{20(\frac{\sqrt{3} }{2})^{2}+1 }$

$Y = \sqrt{20(\frac{3}{4} )+1} = \sqrt{\frac{3(20)}{4}+1 }$

$Y = \sqrt{\frac{60}{4} +1} = \sqrt{15+1} =\sqrt{16}$

$Y = 4$