anonymous
  • anonymous
The amplitude and period of y = cos3xcos7x + sin3xsin7x are ?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
I was reading that lol :)
anonymous
  • anonymous
cos3xcos7x + sin3xsin7x =cos(7x-3x)=cos4x for cos function, amplitude =1 therefore cos4x, amplitude is the same which is 1 period of cosx = 360 that of cos 4x = 360/4 = 90
anonymous
  • anonymous
I have some amendment. Sorry for that

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anonymous
  • anonymous
why is period of cos x = 360 ?
anonymous
  • anonymous
|dw:1333513500176:dw|
anonymous
  • anonymous
and 90 is that 90 degrees ? but why the answer key is pi/2 ?
anonymous
  • anonymous
pi = 180 degree so pi/2 = 90 degree
anonymous
  • anonymous
oh i see
anonymous
  • anonymous
pi is in radian
anonymous
  • anonymous
Thanks CoCoTsoi :)
anonymous
  • anonymous
You are welcome :D

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