Maximum and chnage of sign of a function

  • #1

Main Question or Discussion Point

Guys Can anyone help me in this? I need a function (cos or sin) maximum at 7Pi/4 and at the same time changes sign under phi->phi+Pi with 0< phi< 2Pi....Thank you
 

Answers and Replies

  • #2
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2
Do you know how to shift and stretch functions?
 
  • #3
Yes of course I do and u can find a function that is maximum at 7pi/4 but the problem is how to also make it change sign under phi->phi+Pi...
 
  • #4
HallsofIvy
Science Advisor
Homework Helper
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[tex]sin(x+ \pi)= -sin(x)[/tex]

That's no problem at all!
 
  • #5
Thanks HallsofIvy but the maximum of the function should be at [tex] \phi=\frac{7\pi}{4}[/tex]. I guess the function should be [tex] \sin (\phi-\frac{\pi}{4}) [/tex]
 

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