2 files changed, 2 insertions, 22 deletions
diff --git a/Help/guide/tutorial/Step9/MathFunctions/CMakeLists.txt b/Help/guide/tutorial/Step9/MathFunctions/CMakeLists.txt
index b4d337b..b40b464 100644
--- a/Help/guide/tutorial/Step9/MathFunctions/CMakeLists.txt
+++ b/Help/guide/tutorial/Step9/MathFunctions/CMakeLists.txt
@@ -26,17 +26,6 @@ target_include_directories(MathFunctions
 # and that anything that links to use will get this define
 target_compile_definitions(MathFunctions INTERFACE "USE_MYMATH")
 
-# does this system provide the log and exp functions?
-include(CheckSymbolExists)
-set(CMAKE_REQUIRED_LIBRARIES "m")
-check_symbol_exists(log "math.h" HAVE_LOG)
-check_symbol_exists(exp "math.h" HAVE_EXP)
-
-if(HAVE_LOG AND HAVE_EXP)
-  target_compile_definitions(MathFunctions
-                             PRIVATE "HAVE_LOG" "HAVE_EXP")
-endif()
-
 # install rules
 install(TARGETS MathFunctions DESTINATION lib)
 install(FILES MathFunctions.h DESTINATION include)
diff --git a/Help/guide/tutorial/Step9/MathFunctions/mysqrt.cxx b/Help/guide/tutorial/Step9/MathFunctions/mysqrt.cxx
index 2b1d889..2ae60c6 100644
--- a/Help/guide/tutorial/Step9/MathFunctions/mysqrt.cxx
+++ b/Help/guide/tutorial/Step9/MathFunctions/mysqrt.cxx
@@ -4,8 +4,6 @@
 // include the generated table
 #include "Table.h"
 
-#include <cmath>
-
 // a hack square root calculation using simple operations
 double mysqrt(double x)
 {
@@ -13,20 +11,13 @@ double mysqrt(double x)
     return 0;
   }
 
-  // if we have both log and exp then use them
-#if defined(HAVE_LOG) && defined(HAVE_EXP)
-  double result = exp(log(x) * 0.5);
-  std::cout << "Computing sqrt of " << x << " to be " << result
-            << " using log and exp" << std::endl;
-#else
   // use the table to help find an initial value
   double result = x;
   if (x >= 1 && x < 10) {
+    std::cout << "Use the table to help find an initial value " << std::endl;
     result = sqrtTable[static_cast<int>(x)];
   }
 
-  // if we have both log and exp then use them
-
   // do ten iterations
   for (int i = 0; i < 10; ++i) {
     if (result <= 0) {
@@ -36,6 +27,6 @@ double mysqrt(double x)
     result = result + 0.5 * delta / result;
     std::cout << "Computing sqrt of " << x << " to be " << result << std::endl;
   }
-#endif
+
   return result;
 }