# Functions with pretensions

The function y=cos(2*pi*t) has a frequency of 1 and the function y=cos(18*pi*t) has a frequency of 9. Plot the two graphs for -5<=t<5 with a sampling interval of 0.1 and they both look exactly the same. What has happened?

#frequencyanalysis #dsp #nyquistfrequency #trigonometricfunctions #mathematicsforelectricalengineeringandcomputing5.3 #mathematicsforelectricalengineeringandcomputing12.2

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