b-- (- v d) = (b v d) Pop) = -pvr (4) - v d= (-vb- v d) (4- v bv d) (6) b- v d- = (b v d-) d)- 6 J-(b + d) = (- 5) + (1+ d) D (und) - b= (1-b) - d- d) (P-9)^(p-1)=p-qar) O d = (b - d-) vd (b) d-b=b--- (e) Use the laws of propositional logic to prove the following