2D oplimization plot from derivative inverse function

Hello,

for x=1 i have a formula as shown bellow which is a derivative inverse function:

I need to plot an optimization map for Y3 to be bellow 5 for A=1-10 B=1-10

how ca we do it? i have optimization toolbox,but i coulnd find for such complex expression.

Y=A./(log(x)-B);
Y2=finverse(Y)
Y3=diff(Y2)