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anonymous

  • one year ago

(cos Θ + cos Θ)2 + (cos Θ + cos Θ)2 Can someone please help me with this??

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  1. Astrophysics
    • one year ago
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    Are you sure it's \[(\cos \theta+\cos \theta)^2+(\cos \theta+\cos \theta)^2\]

  2. anonymous
    • one year ago
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    yeah you have it right

  3. Astrophysics
    • one year ago
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    Ok, so notice that \[\cos \theta + \cos \theta = 2\cos \theta\]

  4. anonymous
    • one year ago
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    okay

  5. Astrophysics
    • one year ago
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    \[(2\cos(\theta))^2+(2\cos(\theta))^2\] so we have this now

  6. Astrophysics
    • one year ago
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    What do you get

  7. anonymous
    • one year ago
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    im not sure

  8. anonymous
    • one year ago
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    sin^2theta?

  9. Astrophysics
    • one year ago
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    No just follow algebra rules what is \[(2\cos \theta)^2\]

  10. anonymous
    • one year ago
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    (2cosT)(2cost)?

  11. Astrophysics
    • one year ago
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    Yeah

  12. Astrophysics
    • one year ago
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    So what is that

  13. anonymous
    • one year ago
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    cos^2t?

  14. Astrophysics
    • one year ago
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    \[(2\cos(\theta))^2 = 4\cos^2(\theta)\]

  15. anonymous
    • one year ago
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    ohhh okay

  16. Astrophysics
    • one year ago
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    Now you have \[4\cos^2 \theta+4\cos^2 \theta\] what is that

  17. Astrophysics
    • one year ago
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    It's just like saying 4x+4x

  18. anonymous
    • one year ago
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    8cos^2t?

  19. Astrophysics
    • one year ago
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    Yup

  20. anonymous
    • one year ago
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    okay

  21. anonymous
    • one year ago
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    and then what

  22. Astrophysics
    • one year ago
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    That's it

  23. anonymous
    • one year ago
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    thats not one of the options

  24. anonymous
    • one year ago
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    unless i can just put 8?

  25. Astrophysics
    • one year ago
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    What are the options

  26. anonymous
    • one year ago
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    sin2 Θ 4 8 cos2 Θ

  27. Astrophysics
    • one year ago
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    When you post a question, give everything

  28. Astrophysics
    • one year ago
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    I think you gave the wrong problem, because all of those are wrong.

  29. anonymous
    • one year ago
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    okay im sorry

  30. anonymous
    • one year ago
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    (cos Θ + cos Θ)^2 + (cos Θ + cos Θ)^2

  31. anonymous
    • one year ago
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    thats the problem

  32. Astrophysics
    • one year ago
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    Can you take an image of it

  33. anonymous
    • one year ago
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  34. Astrophysics
    • one year ago
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    All your options are incorrect :\

  35. anonymous
    • one year ago
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    those are the options i was given

  36. Astrophysics
    • one year ago
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    It should be 8 cos^2x

  37. Astrophysics
    • one year ago
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    theta*

  38. anonymous
    • one year ago
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    i dont know

  39. anonymous
    • one year ago
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    those are the answers i was given im sorry

  40. Astrophysics
    • one year ago
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    Wolf agrees http://www.wolframalpha.com/input/?i=%28cosx%2Bcosx%29%5E2%2B%28cosx%2Bcosx%29%5E2

  41. Astrophysics
    • one year ago
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    Is there more to the problem

  42. anonymous
    • one year ago
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    no

  43. Astrophysics
    • one year ago
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    Well, I'm not sure then, who ever made your problem must've been lazy.

  44. anonymous
    • one year ago
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    i thik so thanks though

  45. Astrophysics
    • one year ago
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    Np

  46. Astrophysics
    • one year ago
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    You should message your teacher

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