I'm trying to do something very simple...(adsbygoogle = window.adsbygoogle || []).push({});

I'd like to have a sine function, where the frequency is controlled by a separate frequency function

Something like this:

g(t) = sin(2*pi*f(t)*t)

Assume that

f(t) = 20*exp(-2*t)+4

I would expect a sine wave that starts at 24 Hz and then slowly slows down to 4 Hz.

But when I plot it, I get some strange results for t in [0.5, 2], see attached image. The frequency for those values is very low. How's that possible? Is it my plotting program that acts funny? How can I get the expected (described) behaviour?

Thanks in advance!

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# Sine wave with variable frequency

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