1)

a)

b) 48.19 +360n

2)

a)

b)

45 +360n

of course the answer to number 2 is 45 +180n

but the answer to number 1 is 48.19 +360n! So what's the difference between the two? They are both cosine functions. I just thought always add 360 degrees because that's when the angle repeats itself.

(*fixed the bold...)