Question

is anyone good with cosine

Answer 1

it may help to post a more indepth question .... this is rather vague

Answer 2

@amistre64

Answer 3

which one do you think is most likely?

Answer 4

@Lyrae c?

Answer 5

c looks good to me too

the tricky part is the period ... cos has a normal period at cos(2pi)

when does 2t = 2pi? when t=pi of course .... so yeah, the cycle should end at pi

Answer 6

okay thanks!