Question

cos^2x is it periodic? some help please

Answer 1

Hmmm so we know that cosine is periodic right? It's a wave that goes up and down with period 2pi.
So we have to ask ourselves, if we square that function is it still periodic, hmmmm.

Answer 2

is it?please

Answer 3

Well. Think about it. If a cosing function is periodic, does the square change anything?

Answer 4

no?

Answer 5

its still periodic..???

Answer 6

some help pleaseeeee?

Answer 7

sketch out some points
what is cos^2(0), cos^2(pi/2), cos^2(pi) etc.?

Answer 8

^. Test it out. Look at a graph if you have to.