Question

(cos Θ + cos Θ)2 + (cos Θ + cos Θ)2

Can someone please help me with this??

Answer 1

Are you sure it's \[(\cos \theta+\cos \theta)^2+(\cos \theta+\cos \theta)^2\]

Answer 2

yeah you have it right

Answer 3

Ok, so notice that \[\cos \theta + \cos \theta = 2\cos \theta\]

Answer 4

okay

Answer 5

\[(2\cos(\theta))^2+(2\cos(\theta))^2\] so we have this now

Answer 6

What do you get

Answer 7

im not sure

Answer 8

sin^2theta?

Answer 9

No just follow algebra rules what is \[(2\cos \theta)^2\]

Answer 10

(2cosT)(2cost)?

Answer 11

Yeah

Answer 12

So what is that

Answer 13

cos^2t?

Answer 14

\[(2\cos(\theta))^2 = 4\cos^2(\theta)\]

Answer 15

ohhh okay

Answer 16

Now you have \[4\cos^2 \theta+4\cos^2 \theta\] what is that

Answer 17

It's just like saying 4x+4x

Answer 18

8cos^2t?

Answer 19

Yup

Answer 20

okay

Answer 21

and then what

Answer 22

That's it

Answer 23

thats not one of the options

Answer 24

unless i can just put 8?

Answer 25

What are the options

Answer 26

sin2 Θ

4

8

cos2 Θ

Answer 27

When you post a question, give everything

Answer 28

I think you gave the wrong problem, because all of those are wrong.

Answer 29

okay im sorry

Answer 30

(cos Θ + cos Θ)^2 + (cos Θ + cos Θ)^2

Answer 31

thats the problem

Answer 32

Can you take an image of it

Answer 33

All your options are incorrect :\

Answer 34

those are the options i was given

Answer 35

It should be 8 cos^2x

Answer 36

theta*

Answer 37

i dont know

Answer 38

those are the answers i was given im sorry

Answer 39

Wolf agrees http://www.wolframalpha.com/input/?i=%28cosx%2Bcosx%29%5E2%2B%28cosx%2Bcosx%29%5E2

Answer 40

Is there more to the problem

Answer 41

no

Answer 42

Well, I'm not sure then, who ever made your problem must've been lazy.

Answer 43

i thik so thanks though

Answer 44

Np

Answer 45

You should message your teacher