anonymous
  • anonymous
(cos Θ + cos Θ)2 + (cos Θ + cos Θ)2 Can someone please help me with this??
Mathematics
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anonymous
  • anonymous
(cos Θ + cos Θ)2 + (cos Θ + cos Θ)2 Can someone please help me with this??
Mathematics
katieb
  • katieb
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Astrophysics
  • Astrophysics
Are you sure it's \[(\cos \theta+\cos \theta)^2+(\cos \theta+\cos \theta)^2\]
anonymous
  • anonymous
yeah you have it right
Astrophysics
  • Astrophysics
Ok, so notice that \[\cos \theta + \cos \theta = 2\cos \theta\]

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anonymous
  • anonymous
okay
Astrophysics
  • Astrophysics
\[(2\cos(\theta))^2+(2\cos(\theta))^2\] so we have this now
Astrophysics
  • Astrophysics
What do you get
anonymous
  • anonymous
im not sure
anonymous
  • anonymous
sin^2theta?
Astrophysics
  • Astrophysics
No just follow algebra rules what is \[(2\cos \theta)^2\]
anonymous
  • anonymous
(2cosT)(2cost)?
Astrophysics
  • Astrophysics
Yeah
Astrophysics
  • Astrophysics
So what is that
anonymous
  • anonymous
cos^2t?
Astrophysics
  • Astrophysics
\[(2\cos(\theta))^2 = 4\cos^2(\theta)\]
anonymous
  • anonymous
ohhh okay
Astrophysics
  • Astrophysics
Now you have \[4\cos^2 \theta+4\cos^2 \theta\] what is that
Astrophysics
  • Astrophysics
It's just like saying 4x+4x
anonymous
  • anonymous
8cos^2t?
Astrophysics
  • Astrophysics
Yup
anonymous
  • anonymous
okay
anonymous
  • anonymous
and then what
Astrophysics
  • Astrophysics
That's it
anonymous
  • anonymous
thats not one of the options
anonymous
  • anonymous
unless i can just put 8?
Astrophysics
  • Astrophysics
What are the options
anonymous
  • anonymous
sin2 Θ 4 8 cos2 Θ
Astrophysics
  • Astrophysics
When you post a question, give everything
Astrophysics
  • Astrophysics
I think you gave the wrong problem, because all of those are wrong.
anonymous
  • anonymous
okay im sorry
anonymous
  • anonymous
(cos Θ + cos Θ)^2 + (cos Θ + cos Θ)^2
anonymous
  • anonymous
thats the problem
Astrophysics
  • Astrophysics
Can you take an image of it
anonymous
  • anonymous
Astrophysics
  • Astrophysics
All your options are incorrect :\
anonymous
  • anonymous
those are the options i was given
Astrophysics
  • Astrophysics
It should be 8 cos^2x
Astrophysics
  • Astrophysics
theta*
anonymous
  • anonymous
i dont know
anonymous
  • anonymous
those are the answers i was given im sorry
Astrophysics
  • Astrophysics
Wolf agrees http://www.wolframalpha.com/input/?i=%28cosx%2Bcosx%29%5E2%2B%28cosx%2Bcosx%29%5E2
Astrophysics
  • Astrophysics
Is there more to the problem
anonymous
  • anonymous
no
Astrophysics
  • Astrophysics
Well, I'm not sure then, who ever made your problem must've been lazy.
anonymous
  • anonymous
i thik so thanks though
Astrophysics
  • Astrophysics
Np
Astrophysics
  • Astrophysics
You should message your teacher

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