Is this graph indicating stable system or unstable system?

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iVenky

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Actually I have plotted this for the function

e(½*t) * sin(2*pi*t)

This should mean that the system is unstable. But from the nyquist plot I am not getting it as stable. What I have read is this- If the amplitude( which is the radial length in the Nyquist plot) is greater than 1 then the system is unstable but what I get is less than 1.

Here's image



Thanks in advance.
 

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