Question

ayúdenme
determina el valor numérico de la expresión​

Answer 1

$a = \frac{ \frac{ \cos {}^{2} (60 ) }{ \sin {}^{2} (60) } + \frac{1}{2} \frac{1}{ \cos {}^{2} (45) } - \frac{3}{2} \frac{1}{ \sin {}^{2} (60) } } { \sin {}^{2} (30) + \frac{3}{5} \frac{ \cos {}^{2} (45) }{ \sin {}^{2} (45) } }$

sabiendo que :

cos(60)= 1/2

$\sin(45) = \frac{ \sqrt[]{2} }{2}$

$\sin(60) = \frac{ \sqrt[]{3} }{2}$

$</p><p>\cos(45) = \frac{ \sqrt[]{2} }{2} \\ </p><p>\sin(30) = \frac{1}{2}$

$a = \frac{ \frac{ \frac{1}{4} }{ \frac{3}{4} } + \frac{1}{2} \frac{1}{ \frac{2}{4} } - \frac{3}{2} \frac{1}{ \frac{3}{4} } }{ \frac{1}{4} + \frac{3}{5} \frac{ \frac{2}{4} }{ \frac{2}{4} } } \\ </p><p>a = - 3.79265$