Complementary angles are angles that add up to 90º. For example, 30º and 60º.
Supplementary angles are angles that add up to 180º. For example, 120º and 60º.

means to say that for any given
, we can find
such that anytime
(i.e. the whenever
is "close enough" to 5), we can guarantee that
(i.e. the value of
is "close enough" to the limit value).
What we want to end up with is

Dividing both sides by 3 gives

which suggests
is a sufficient threshold.
The proof itself is essentially the reverse of this analysis: Let
be given. Then if

and so the limit is 7. QED
Answer:
Option A:
,
, and 
Step-by-step explanation:




,
, and 