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diff --git a/Oscillations_and_Waves_by_S_Prakesh/11-Lissajous_Figures.ipynb b/Oscillations_and_Waves_by_S_Prakesh/11-Lissajous_Figures.ipynb
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+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 11: Lissajous Figures"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 11.1: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 1// Frequencies\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"t=2;// in sec\n",
+"n1=100;// in vibrations/sec\n",
+"n2a=n1+(1/t);\n",
+"n2b=n1-(1/t);\n",
+"disp(n2a,'frequency,n2a= ')\n",
+"disp(n2b,'frequency,n2b = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 11.2: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 2// Frequencies\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"t1=15;// in sec\n",
+"t2=10;// in sec\n",
+"n2=400;// in vibrations/sec\n",
+"n1a=n2+(1/t1);\n",
+"n1b=n2-(1/t1);\n",
+"disp(n1a,'frequency,n1a(Hz) = ')\n",
+"disp(n1b,'frequency,n1b(Hz) = ')\n",
+"n_1a=n2+(1/t2);\n",
+"n_1b=n2-(1/t2);\n",
+"disp(n_1a,'frequency,n_1a(Hz) = ')\n",
+"disp(n_1b,'frequency,n_1b(Hz) = ')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 11.3: frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 3// Frequencies\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"t1=15;// in sec\n",
+"t2=10;// in sec\n",
+"n2=256;// in vibrations/sec\n",
+"n1a=(2*n2)+(1/t1);\n",
+"n1b=(2*n2)-(1/t1);\n",
+"disp(n1a,'frequency,n1a(Hz) = ')\n",
+"disp(n1b,'frequency,n1b(Hz) = ')\n",
+"n_1a=(2*n2)+(1/t2);\n",
+"n_1b=(2*n2)-(1/t2);\n",
+"disp(n_1a,'frequency,n_1a(Hz) = ')\n",
+"disp(n_1b,'frequency,n_1b(Hz) = ')"
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}