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+clc,clear
+//Example 6.11
+//To determine product and ratio of complex numbers using formula
+
+//given values 
+z1 = 6*(cosd(70)+ %i*sind(70));
+z2 = 2*(cosd(31)+ %i*sind(31));
+
+//arguements of complex numbers
+theta1=phasemag(z1);
+theta2=phasemag(z2);
+//modulus of complex numbers
+r1=abs(z1);
+r2=abs(z2);
+theta_1p2 =theta1 + theta2  ;//theta1 + theta 2
+theta_1m2 =theta1 - theta2  ;//theta1 - theta 2
+//according to the formula used in book
+product = r1*r2*(cosd(theta_1p2)+%i*sind(theta_1p2));
+ratio = (r1/r2)*(cosd(theta_1m2)+%i*sind(theta_1m2));
+
+printf('z1*z2 = %.0f*(cos(%.0f)+i*sin(%.0f))\n',r1*r2,phasemag(product),phasemag(product))
+printf('z1/z2 = %.0f*(cos(%.0f)+i*sin(%.0f))\n',r1/r2,phasemag(ratio),phasemag(ratio))