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MathSofiya Group Title

Would this be correct? \[f(x)=cos(\frac{(\pi x)}{2}\] Use MacLaurin table \[cosx=\sum_{n=0}^{\infty}(-1)^n\frac{x^{2n}}{(2n)!}\]=\[1-\frac{x^2}{2!}+\frac{x^4}{4!}-frac{x^6}{6}\] \[cos(\frac{(\pi x)}{2})=\sum_{n=0}^{\infty}(-1)^n\frac{\frac{(\pi x)}{2}^{2n}}{(2n)!}\]=\[1-\frac{\frac{(\pi x)}{2}^2}{2!}+\frac{\frac{(\pi x)}{2}^4}{4!}-frac{\frac{(\pi x)}{2}^6}{6}\]

  • 2 years ago
  • 2 years ago

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  1. Spacelimbus Group Title
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    \[ \Large \left(\frac{\pi x}{2}\right)^{2n} \]

    • 2 years ago
  2. Spacelimbus Group Title
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    The site is a bit dodgy for me today, it keeps reloading and kicking me out so I am not sure if I see the original equation correct.

    • 2 years ago
  3. MathSofiya Group Title
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    sorry about that. The first line should read: \[f(x)=cos(\frac{\pi x}{2})\]

    • 2 years ago
  4. MathSofiya Group Title
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    The second line was meant to be the macLaurin series for cos(x) that I found in my book. \[cosx=\sum_{n=0}^{\infty}(-1)^n\frac{x^{2n}}{(2n)!}=1-\frac{x^2}{2!}+\frac{x^4}{4!}-\frac{x^6}{6!}\]

    • 2 years ago
  5. MathSofiya Group Title
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    the final few lines are what I believe the answer should be. \[cos\left(\frac{\pi x}{2}\right)=\sum_{n=0}^{\infty}(-1)^n\frac{\frac{(\pi x)}{2}^{2n}}{(2n)!}\]

    • 2 years ago
  6. Spacelimbus Group Title
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    Good, so you want to put wherever you see an x, you want to put the following: \[ \Large \left( \frac{\pi x}{2} \right) \] right? because that is your new 'x' which you can substitute into the given equation.

    • 2 years ago
  7. MathSofiya Group Title
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    yeah I think so. That would make. \[1-\frac{\left(\frac{\pi x}{2}\right)^2}{2!}+\frac{\left(\frac{\pi x}{2}\right)^4}{4!}-\frac{\left(\frac{\pi x}{2}\right)^6}{6!}\]

    • 2 years ago
  8. Spacelimbus Group Title
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    yes, exactly! I was confused first, because the way you did \(\LaTeX\) it in your original post it looked like you would take the Exponent \(2n\) only in consideration for the numerator, but you also have to take it in consideration for your denominator - just like you did!

    • 2 years ago
  9. MathSofiya Group Title
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    Thank you! It's kinda difficult typing latex blindly in the Question box to the left.

    • 2 years ago
  10. Spacelimbus Group Title
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    No problem, you did it all right then, I was just making sure that you noticed that (-: And I agree, there should at least be a preview function of the post!

    • 2 years ago
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