Question

What is the next step for 2cos(8θ/2)cos(-2θ/2) ???

Answer 1

Divide 2 with 8 and -2 first..

Answer 2

what do you want to prove ? :)

Answer 3

I would like to solve 2cos(8θ/2)cos(-2θ/2) but i dont know how

Answer 4

@waterineyes why do we have to divide by 2?

Answer 5

"solve".... how ? ......the question ?!

Answer 6

to simplify:

\[2 \cos(\frac{8 \theta}{2}) \cos(\frac{-2 \theta}{2}) \implies 2 \cos(4 \theta) \cos(-\theta)\]

\(cos( - \theta) = cos(\theta)\)

Answer 7

how did the denominator disappear?

Answer 8

Cancel 2 with 8..

Answer 9

math is so hard.i hate being a student.

Answer 10

Nooo! what do you want to do exactly ?@lsugano

Answer 11

Ohi got the answer so its okay! its just that theres so many ways to find the answer and so many identities its making my calculations really hard! but i got it now!

Answer 12

Im going to do a different question like this! If you dont mind, could you please check if imdoing it right?

Answer 13

kk Sure !

Answer 14

so far i got up to this!

Answer 15

yes ! go on that's correct !

Answer 16

:) I'm happy ! Go on !

Answer 17

how do you get rid of the 2 in the denominator...? divide by 2?

Answer 18

that's easy !
\[\frac{\frac{1}{2}}{2}\]=?

Answer 19

1/4

Answer 20

yes ! \[\frac{\frac{5\theta}{6}}{2}=??\]

Answer 21

You're a great "student" :) !

Answer 22

YAY! thank you!!

Answer 23

you're welcome ! :) :)