diff --git a/glm/gtc/reciprocal.inl b/glm/gtc/reciprocal.inl
index e40eb7f3..48cff39d 100644
--- a/glm/gtc/reciprocal.inl
+++ b/glm/gtc/reciprocal.inl
@@ -37,7 +37,7 @@ namespace glm
 {
 	// sec
 	template <typename genType>
-	GLM_FUNC_QUALIFIER genType sec(genType angle)
+	GLM_FUNC_QUALIFIER genType sec(genType const & angle)
 	{
 		GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'sec' only accept floating-point values");
 		return genType(1) / glm::cos(angle);
@@ -52,7 +52,7 @@ namespace glm
 
 	// csc
 	template <typename genType>
-	GLM_FUNC_QUALIFIER genType csc(genType angle)
+	GLM_FUNC_QUALIFIER genType csc(genType const & angle)
 	{
 		GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'csc' only accept floating-point values");
 		return genType(1) / glm::sin(angle);
@@ -84,7 +84,7 @@ namespace glm
 
 	// asec
 	template <typename genType>
-	GLM_FUNC_QUALIFIER genType asec(genType x)
+	GLM_FUNC_QUALIFIER genType asec(genType const & angle)
 	{
 		GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'asec' only accept floating-point values");
 		return acos(genType(1) / x);
@@ -99,7 +99,7 @@ namespace glm
 
 	// acsc
 	template <typename genType>
-	GLM_FUNC_QUALIFIER genType acsc(genType x)
+	GLM_FUNC_QUALIFIER genType acsc(genType const & angle)
 	{
 		GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'acsc' only accept floating-point values");
 		return asin(genType(1) / x);
@@ -114,7 +114,7 @@ namespace glm
 
 	// acot
 	template <typename genType>
-	GLM_FUNC_QUALIFIER genType acot(genType x)
+	GLM_FUNC_QUALIFIER genType acot(genType const & angle)
 	{
 		GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'acot' only accept floating-point values");
 
@@ -131,7 +131,7 @@ namespace glm
 
 	// sech
 	template <typename genType>
-	GLM_FUNC_QUALIFIER genType sech(genType angle)
+	GLM_FUNC_QUALIFIER genType sech(genType const & angle)
 	{
 		GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'sech' only accept floating-point values");
 		return genType(1) / glm::cosh(angle);
@@ -146,7 +146,7 @@ namespace glm
 
 	// csch
 	template <typename genType>
-	GLM_FUNC_QUALIFIER genType csch(genType angle)
+	GLM_FUNC_QUALIFIER genType csch(genType const & angle)
 	{
 		GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'csch' only accept floating-point values");
 		return genType(1) / glm::sinh(angle);
@@ -161,7 +161,7 @@ namespace glm
 
 	// coth
 	template <typename genType>
-	GLM_FUNC_QUALIFIER genType coth(genType angle)
+	GLM_FUNC_QUALIFIER genType coth(genType const & angle)
 	{
 		GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'coth' only accept floating-point values");
 		return glm::cosh(angle) / glm::sinh(angle);
@@ -176,7 +176,7 @@ namespace glm
 
 	// asech
 	template <typename genType>
-	GLM_FUNC_QUALIFIER genType asech(genType x)
+	GLM_FUNC_QUALIFIER genType asech(genType const & angle)
 	{
 		GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'asech' only accept floating-point values");
 		return acosh(genType(1) / x);
@@ -191,7 +191,7 @@ namespace glm
 
 	// acsch
 	template <typename genType>
-	GLM_FUNC_QUALIFIER genType acsch(genType x)
+	GLM_FUNC_QUALIFIER genType acsch(genType const & angle)
 	{
 		GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'acsch' only accept floating-point values");
 		return acsch(genType(1) / x);
@@ -206,7 +206,7 @@ namespace glm
 
 	// acoth
 	template <typename genType>
-	GLM_FUNC_QUALIFIER genType acoth(genType x)
+	GLM_FUNC_QUALIFIER genType acoth(genType const & angle)
 	{
 		GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'acoth' only accept floating-point values");
 		return atanh(genType(1) / x);