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+
+//Eg-9.4
+//pg-394
+
+clear
+clc
+clc;
+clear;
+
+deff('[z]=f(x)','z=(x^4-2*x^2)*sin(x)');
+x1=-1:.2:1;
+//values of fx obtained manually
+
+fx1=[.841471;0.624387;.333365;.114645;.015576;0;-.015576;-.114645;-.333365;-.624387;-.841471];
+
+plot(x1,feval(x1,f));
+set(gca(),"auto_clear","off")
+plot(x1,fx1,'*');