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+{{keywords>wiki library source code example reference}}
+===== tanh =====
+<code c>
+    double tanh(double);
+</code>
+Returns hyperbolic tangent of a radian angle x.
+===== C Sourcecode Example =====
+compile with tanh.c -o tanh **-lm**
+<code c>
+#include <stdio.h> /* including standard library */
+//#include <windows.h> /* uncomment this for Windows */
+#include <math.h> /* including math library */
+int main( void )
+{
+    double x;
+    x = log(42);
+    printf ("hyperbolic tangent of 42 is %lf\n", tanh (x) );
+    return 0;
+}
+</code>
+==== output ====
+   output:
+   user@host:~$ ./tanh
+   hyperbolic tangent of 42 is 0.998867

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