All you need to know is that

So, the first function grows exponentially and the second decays exponentially. The rate of growth/decay are the bases of the exponentials, which means 1.08 and 0.205
there are nine ducks and 3 swans
sqrt of 9 equals 3
3 + 9 = 12
Answer:
The answer to the question provided is

Step-by-step explanation:
T
If this is supposed to be

Then this can simply be reduced to

by the double angle formula for cosine