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+//Example 1.35<a>
+//Find whether the given system is causal or not y(t)=x*sin(t).
+clear all;
+clc;
+t=-10:10;
+x=2;
+for i=1:length(t)
+x3(i)=x*sin(t(i));
+end
+causal=%t;
+for i=1:length (t)
+if t(i)<0 & x3(i)~=0 then
+noncausal=%f;
+end
+end
+disp (noncausal,"The statement that the system is noncausal is");