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diff --git a/Electronic_Devices_And_Circuits/EDC_ch_4_1.ipynb b/Electronic_Devices_And_Circuits/EDC_ch_4_1.ipynb
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+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter No.4: Frequency Response"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 4.1, Page No. 170"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#3dB Frequency\n",
+      "import math\n",
+      "\n",
+      "#variable declaration\n",
+      "Omega_Z1=0.0           #in Radian/sec\n",
+      "Omega_Z2=10.0          #in Radian/sec\n",
+      "Omega_P1=100.0         #in Radian/sec\n",
+      "Omega_P2=25.0          #in Radian/sec\n",
+      "\n",
+      "#calculations\n",
+      "WL=math.sqrt(Omega_P1**2+Omega_P2**2-2*Omega_Z1**2-2*Omega_Z2**2)      #in radian/sec\n",
+      "\n",
+      "#Result\n",
+      "print(\"Approximate value of lower 3dB Frequency in radian/sec : %.1f\"%WL)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Approximate value of lower 3dB Frequency in radian/sec : 102.1\n"
+       ]
+      }
+     ],
+     "prompt_number": 4
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "example 4.2, Page No. 171"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Upper 3dB Frequency\n",
+      "import math\n",
+      "#variable declaration\n",
+      "Omega_P1=1.0*10**4                 #in Radian/sec\n",
+      "Omega_P2=2.0*10**4               #in Radian/sec\n",
+      "Omega_Z1=1.0*10**5                 #in Radian/sec\n",
+      "\n",
+      "#calculations\n",
+      "omegaH=1/math.sqrt(1/Omega_P1**2+1/Omega_P2**2-2/Omega_Z1**2)     #in radian/sec\n",
+      "\n",
+      "#result\n",
+      "print(\"Approximate value of lower 3dB Frequency in radian/sec :  %.0f \"%(math.ceil(omegaH)))"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Approximate value of lower 3dB Frequency in radian/sec :  9017 \n"
+       ]
+      }
+     ],
+     "prompt_number": 8
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file