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+//chapter17
+//example17.5
+//page382
+
+R=220d3 // ohm
+C=250d-12 // F
+
+f=1/(2*%pi*R*C)
+printf("frequency of oscillations = %.3f Hz",f)
+
+//in book the answer given is 2892 Hz but the accurate answer is 2893.726 Hz