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diff --git a/2459/CH19/EX19.5/Ex19_5.sce b/2459/CH19/EX19.5/Ex19_5.sce
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+//chapter19
+//example19.5
+//page420
+
+// v=5*(1+0.6*cos(6280*t))*sin(211d4*t) V
+// compare with v=Ec*(1+m*cos(ws*t))*sin(wc*t) we get
+Ec=5 // V
+m=0.6
+fs=6280/(2*%pi) // Hz
+fc=211d4/(2*%pi) // Hz
+
+Vmin=Ec-m*Ec
+Vmax=Ec+m*Ec
+
+f1=(fc-fs)/1000 // in kHz
+f2=fc/1000 // in kHz
+f3=(fc+fs)/1000 // in kHz
+
+V1=m*Ec/2
+V2=Ec
+V3=m*Ec/2
+
+printf("minimum amplitude = %.3f V and maximum amplitude = %.3f V \n",Vmin,Vmax)
+printf("frequency components = %.1f kHz, %.1f Hz, %.1fkHz \n",f1,f2,f3)
+printf("amplitudes of components = %.3f V, %.3f V, %.3f V \n",V1,V2,V3)
+
+// in book there is error of 0.2 kHz in every frequency component. The accurate answers are 334.8,335.8,336.8 kHz