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+// chapter 3
+// example 3.20
+//page 164,figure 3.74
+R1=100*10^3;R2=100*10^3;Rf=470;//given
+// gain=(1+2Rf/Rg)(R2/R1)
+gain=100;//given
+Rg=(((gain/(R2/R1))-1)\(2*Rf));
+disp(Rg)//result for Rg so that gain is 100
+\ No newline at end of file