Answer:
Step-by-step explanation:

Solution :
We have to prove that
(De-Morgan's law)
Let
then
and 
and so
and
.
Thus,
and so 
Hence,
.........(1)
Now we will show that 
Let
⇒
Thus x is present neither in the set A nor in the set B, so by definition of the union of the sets, by definition of the complement.
and 
Therefore,
and we have
.............(2)
From (1) and (2),
Hence proved.
Answer:
Where is the picture? Also, Im kinda confused
Step-by-step explanation:
Answer:
Step-by-step explanation:
whats the question i cant read it
i can help you once i know
Answer:
30°
Step-by-step explanation:
Law of Sines = 


Therefore, m∠B = 30°
Hope that's right and helps