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Question: im trying to plot a function involving "e" but keep getting warning labels,

Question:im trying to plot a function involving "e" but keep getting warning labels,

jayroads 5 Maple 2017
plot
March 12 2019
1

I'm trying to plot a function involving exp but keep getting warnings.

How can i avoid this?

plot(2*cos(t)/sqrt((1+exp(-eps*t))*(4/a^2-1)))

but getting the warning message

"Warning, unable to evaluate the function to numeric values in the region; complex values were detected"
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