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+import graph;
+size(8cm,6cm,IgnoreAspect);
+
+typedef real realfcn(real);
+realfcn F(real p) {
+ return new real(real x) {return sin(p*x);};
+};
+
+for(int i=1; i < 5; ++i)
+ draw(graph(F(i*pi),0,1),Pen(i),
+ "$\sin("+(i == 1 ? "" : (string) i)+"\pi x)$");
+xaxis("$x$",BottomTop,LeftTicks);
+yaxis("$y$",LeftRight,RightTicks(trailingzero));
+
+attach(legend(2),(point(S).x,truepoint(S).y),10S,UnFill);