Question

Find a formula for the following sequence:

{1, 0, -1, 0, 1, 0, -1, 0}

I would like a hint please, not the answer

Answer 1

cos() ?

Answer 2

i think you are on the right track, you have to use \(\large\cos(\dots)\)

write the formula for \(\Large a_n\) i.e. the n term of the sequence, in terms of n.

Answer 3

@PaxPolaris

I have: