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sen150° = sen30° = 1/2
cos120° = - cos60° = - 1/2
sec150° = - sec30° = - 2/√3
csc 120° = csc60° = 2/√3
REEMPLAZANDO:
E = (1/2)(- 1/2) + (- 2/√3)(2/√3)
E = - 1/4 - 4/3
E = (- 3 - 16)/12 = - 19/12
ESO ES TODO, SALUDOS.........