anonymous
  • anonymous
if sin ^ 2 x =sin 4 x.what is x.pls help
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
\[\sin ^{2}x=\sin4x\]
anonymous
  • anonymous
= +4 , - 4 but I'm not sure
anonymous
  • anonymous
do you have a selections of answer?

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anonymous
  • anonymous
there are many solutions here.....
anonymous
  • anonymous
some solutions are 0,180 360 degrees
anonymous
  • anonymous
if tried plugging in identities but got nowhere. by inspection one solution is sin x = 0
anonymous
  • anonymous
for advanced students you can use newtons method of iteration
anonymous
  • anonymous
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
anonymous
  • anonymous
geee my pc keeps hanging up...lol
anonymous
  • anonymous
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....
anonymous
  • anonymous
right
anonymous
  • anonymous
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!
anonymous
  • anonymous
tnx a lot guys!!

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