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180-90-53=37
Sacamos y con la funcion sen(37)
Sen(37)= Opuesto/hipotenusa
0.6 = 21/y
y0.6 =21
y=21/0.6
y=35
Sacamos x, con la funcion sen(53)
Sen(53) = x/35
0.8 = x/35
35*0.8 = x
x = 28
Ahora sumamos x+y
28+35
63
Respuesta A