Question

How would you use the squared identities to simplify cos^2x cos^2x?

a) 3+4cos (2x) + cos (4x)/8
b) 3-4cos (2x) + cos (4x)/8
c) 3+4cos (2x) - cos (4x)/8
d) 3-4cos (2x) - cos (4x)/8

Answer 1

a) 3+4cos (2x) + cos (4x)/8

Answer 2

Got it ?

Answer 3

how did you get the answer? and thank you!

Answer 4

I used cos^x = ( cos2x+1)/2 twice

Answer 5

I can show you if you want

Answer 6

Yes, please. I'm a bit confused and would really like to learn how to solve it. :)

Answer 7

Do you use skype ?

Answer 8

No, sorry, I don't. Is there a way to show here? If not it's ok i can ask my teacher on monday.

Answer 9

Okay .. I am going to type it . if you had something where I could show you I guess it would be nice ...

Answer 10

This is really the only place, sorry. It's okay if it's not possible and thanks for the answer!

Answer 11

It's your answer

Answer 12

wow, thank you so much!!!