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diff --git a/74/CH4/EX4.3/example3_sce.sce b/74/CH4/EX4.3/example3_sce.sce
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+// chapter 4
+// example 4.3
+// page 194
+Vp_p=5;//peak to peak volatage of sine wave
+Vlt=-1.5;//lower threshold level
+Vh=2;// hysteresis width
+f=1000;
+Vut=Vh-(-Vlt);
+disp(Vut)
+Vm=Vp_p/2;
+disp(Vm)
+//Vlt=Vm*sin(%pi+x)
+x=36.87;// taking sin invers
+T=1/f;
+disp(T)
+T1=(T*(180+x))/360;//T1 exist for angle 0 to (180+36.87)
+disp(T1)
+T2=T-T1;//t2 exist for angle 216.87 to 360
+disp(T2)
+\ No newline at end of file