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 Feb 14, 2019
edited by Melody  Feb 14, 2019
 #1
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The wavelength here is    \(\pi \)   and that is the only transformation from the parent function of   y=cos x

 

If y= cos nx   then the wavelength will be     \(\frac{2\pi}{n}\)

 

so     

\(\frac{2\pi}{n}=\pi\\ \frac{2}{n}=1\\ n=2\)

 

So it must be      \(y=cos(2x)\)

 

Check by using Desmos graphing calculator.

Desmos is another tool that is very easy to use and very helpful to you. 

 

https://www.desmos.com/calculator/t7prurevsn

 Feb 14, 2019

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