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Question: Warning, solutions may have been lost

Question:Warning, solutions may have been lost

UAV 5 Maple
implicit-differentation
February 15 2017
0

eqn := (A/(1+a*exp(-b*(((atan(h/R))*(180/Pi))-a)))) +10*log10(h^2+R^2)+20*log10(f)+20*log10(4*Pi/c)+nNLOS = 110;

R and h are my unknown variables in the equation

The rest of variables, A,c,f,a,b,NLOS are known.

I need to find solution such that derivate of R w.r.t h = 0, I want to maximize R.
But this equation is implicit, R cannot be separated on one side of the equation. I tried:


> implicitdiff(eq, R, h);


But I get the error:

Warning, solutions may have been lost
 
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