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LUEGO: sen A = cosB , PORQUE A + B = 90°
NOS PIDEN HALLAR:
E = sen^2A + sen^2B + 1
E = cos^2B + sen^2B + 1
NO SE OLVIDE: cos^2B + sen^2B = 1
REEMPLAZANDO:
E = 1 +1 = 2