Question

Half Angle Formula help? Square ((1+cos 4x) / 2)

Answer 1

cos 4x = 2cos^2(2x) - 1
so 1+ cos 4x = 1+2cos^2(2x) -1 = 2cos^2(2x)

Answer 2

isnt is cos 2x?

Answer 3

hmmm?

Answer 4

cos 4x = cos 2(2x) right?
so cos you can apply the formula of cos 2x for this

Answer 5

oh you asked me for the final amswer??? yes it's cos 2x lol

Answer 6

haha yes. thank you!

Answer 7

oh I want to correct the answer again it should be the absolute of cos2x which is more correct loo