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del dato sen(x+y) / cos(x-y) = 1 , entonces:
sen(x+y) = cos(x-y) , por propiedad de co-razón trigonometrica se cumple
x+y + x-y = 90° ----------> 2x = 90° ------> x = 45°
por lo tanto:
E = tan45° + cot45°
E = 1 + 1
E = 2