12 - 3 =9 and -5i+4i=1i or i so it is {9-i}
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Answer:
Step-by-step explanation:
[logical equivalence]
[morgan laws]
if
is true, then
is true and
is too.
with
true, then
is false [double denial]
In the first equivalence it follows that
is true [identity law]
Then it can be concluded that 
Answer:
401.22
Step-by-step explanation: