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anonymous

  • 5 years ago

if sin ^ 2 x =sin 4 x.what is x.pls help

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  1. anonymous
    • 5 years ago
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    \[\sin ^{2}x=\sin4x\]

  2. anonymous
    • 5 years ago
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    = +4 , - 4 but I'm not sure

  3. anonymous
    • 5 years ago
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    do you have a selections of answer?

  4. anonymous
    • 5 years ago
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    there are many solutions here.....

  5. anonymous
    • 5 years ago
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    some solutions are 0,180 360 degrees

  6. anonymous
    • 5 years ago
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    if tried plugging in identities but got nowhere. by inspection one solution is sin x = 0

  7. anonymous
    • 5 years ago
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    for advanced students you can use newtons method of iteration

  8. anonymous
    • 5 years ago
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    lets try again sin^2x = 2 sin2xcos2x 1/2 - (1/2)cos2x = 2 cos2xsin2x this might be the way to go i have to go now

  9. anonymous
    • 5 years ago
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    geee my pc keeps hanging up...lol

  10. anonymous
    • 5 years ago
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    the best way of getting a solution roots is to use newtons method here, but its pretyy advanced for high school students who didnt take calculus yet..lol....

  11. anonymous
    • 5 years ago
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    right

  12. anonymous
    • 5 years ago
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    i graphed this on my calculator and there are 9 roots between 0 and 360 degrees!! 0, 180, 360, 39.1, 106.7, 124.2, 219.1, 286.7, 304.2 mark was right! many roots!

  13. anonymous
    • 5 years ago
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    tnx a lot guys!!

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