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+// Exa 4.9
+
+clc;
+clear;
+
+// Given
+
+// Referring Lissajous pattern shown in figure
+wx = 1 ; // Sum of x-peak pattern
+wy = 2.5; // sum of y-peak pattern
+fx = 3; // frequency of horizontal signal
+
+X = wy/wx ; // X is ratio of fy/fx
+
+// Therefore, fy = 2.5*fx
+
+printf(' Frequency of vertical signal = %.1f kHz \n ',X*fx);
+
+// The answer provided in the textbook is wrong