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diff --git a/2459/CH21/EX21.7/Ex21_7.sce b/2459/CH21/EX21.7/Ex21_7.sce
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+//chapter21
+//example21.7
+//page473
+
+V=-10 // V
+Vout=-0.7 // V
+
+Vr=V-Vout
+
+printf("output voltage = %.3f V \n",Vout)
+printf("voltage across R = %.3f V \n",Vr)
+
+// plotting input and output waveforms in same graph using following code instead of using xcos
+clf()
+t=linspace(0,%pi,100)
+Vin=V*sin(t)
+Vout=Vr*sin(t)
+subplot(1,2,2)
+plot2d(t,Vout,style=3,rect=[0,-0.7,10,11])
+xtitle("Vout","t","volts")
+
+subplot(1,2,1)
+plot2d(t,Vin,style=2,rect=[0,-11,10,1])
+xtitle("Vin","t","volts")