1 files changed, 5 insertions, 0 deletions
diff --git a/lib/libm_dbl/tanh.c b/lib/libm_dbl/tanh.c
new file mode 100644
index 000000000..89743ba90
--- /dev/null
+++ b/lib/libm_dbl/tanh.c
@@ -0,0 +1,5 @@
+#include <math.h>
+
+double tanh(double x) {
+    return sinh(x) / cosh(x);
+}