anonymous
  • anonymous
Challenge: \[f(x)=\sum_{n=1}^{infinty}\sin(\frac{2x}{3^n})\sin(\frac{x}{3^n})\] find f(x) (independent of x) also evaluate the sum of the solutions of the equations f(x)=0 lying in the interval (0,629).
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
I didn't make this up I have hundreds of such problems
anonymous
  • anonymous
What book do you have for these?
anonymous
  • anonymous
It is more of uncomplied collection

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More answers

anonymous
  • anonymous
Any ideas
anonymous
  • anonymous
sin2x = 2cosx*sinx But it doesn't seem to work
anonymous
  • anonymous
We shall use transformation formula
anonymous
  • anonymous
cosc + cosd?
anonymous
  • anonymous
sinxsin2x=1/2 (cosx-cos3x)
anonymous
  • anonymous
Oh yeah cosc-cosd, Sorry
anonymous
  • anonymous
You got it!
anonymous
  • anonymous
NotSObright you're so bright! I think we have it now
anonymous
  • anonymous
I know summation formula for cos of angles in AP not GP
anonymous
  • anonymous
\[f(x) = \cos \frac{x}{3^n} - \cos x, n \to \infty \implies \frac{x}{3^n} \to 0 \implies \cos0 \to 1 \] \[f(x) = 1-\cos{x}\]
anonymous
  • anonymous
I would like to answer more of such problems
anonymous
  • anonymous
Thanka man
anonymous
  • anonymous
f(x)=(1−cosx)/2
anonymous
  • anonymous
yeah cant forget that 2
anonymous
  • anonymous
Look at the new thread

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