Not going to do (1), (2), (3) since they are implicit from (a) and (b) and require graphs (which aren't supported on brainly).
We have , that means, if plug in
we get
.
Doman of cosine is .
Hope this helps.
Matthew is on the swim team every week he swims 20 miles if he practices 4 days each week and swims the same number of miles eac
2 answers:
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Explanation:
a)
b) First, we have that
On the other hand,
Therefore, both expressions are equal. This makes sense, because selecting k elements from a group of n is the same than specify which elements you will not select. In order to specify those elements you need to select the n-k elements that will not be selected. Hence, each time you are selecting k from n, you are also selecting n-k from n, and from that reason both combinatorial numbers are equal.