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diff --git a/74/CH7/EX7.2/example2_sce.sce b/74/CH7/EX7.2/example2_sce.sce
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+//chapter7
+// example 7.2
+//page 259
+R2=%s
+R1=.86*R2
+Vsat=%s
+Rf=%s;
+C=%s;
+y=(Vsat-(R1*(-Vsat))/(R1+R2))/(Vsat-(R1*Vsat)/(R1+R2))
+g=2.72;//g=y=5.0592/1.86
+T=2*Rf*C*log(g)// Rf=C=%s
+disp(T)// %s*%s=s same as 2*Rf*C=2s
+\ No newline at end of file