+ Added example 4

docs/mathex/Makefile

@@ -32,7 +32,7 @@ endif
 
 .PHONY: all tex clean
 
-OBJECTS=ex1 ex2 ex3
+OBJECTS=ex1 ex2 ex3 ex4
 
 TEXOBJECTS=$(addsuffix .tex, $(OBJECTS))
 

docs/mathex/README

@@ -6,3 +6,4 @@ Example programs
 ex1.pp contains an example of the arccos function.
 ex2.pp contains an example of the arcsin function.
 ex3.pp contains an example of the arcosh function.
+ex4.pp contains an example of the arsinh function.

docs/mathex/ex4.pp

@@ -0,0 +1,10 @@
+Program Example4;
+
+{ Program to demonstrate the arsinh function. }
+
+Uses math;
+
+begin
+//  Writeln(arsinh(0));
+  Writeln(arsinh(1));
+end.