diff --git a/reactos/lib/sdk/crt/crt.rbuild b/reactos/lib/sdk/crt/crt.rbuild
index bb78b1739bd..56c2e9491ef 100644
--- a/reactos/lib/sdk/crt/crt.rbuild
+++ b/reactos/lib/sdk/crt/crt.rbuild
@@ -104,6 +104,7 @@
 		<if property="ARCH" value="i386">
 			<directory name="i386">
 				<file>atan2.c</file>
+				<file>ci.c</file>
 				<file>exp.c</file>
 				<file>fmod.c</file>
 				<file>ldexp.c</file>
diff --git a/reactos/lib/sdk/crt/libcntpr.rbuild b/reactos/lib/sdk/crt/libcntpr.rbuild
index 97d7d61175f..4884817f55a 100644
--- a/reactos/lib/sdk/crt/libcntpr.rbuild
+++ b/reactos/lib/sdk/crt/libcntpr.rbuild
@@ -41,6 +41,7 @@
 				<file>aulldvrm_asm.s</file>
 				<file>aullrem_asm.s</file>
 				<file>aullshr_asm.s</file>
+				<file>ci.c</file>
 				<file>ceil_asm.s</file>
 				<file>cos_asm.s</file>
 				<file>fabs_asm.s</file>
diff --git a/reactos/lib/sdk/crt/math/i386/ci.c b/reactos/lib/sdk/crt/math/i386/ci.c
new file mode 100644
index 00000000000..b0a58eb2d5c
--- /dev/null
+++ b/reactos/lib/sdk/crt/math/i386/ci.c
@@ -0,0 +1,137 @@
+#include <precomp.h>
+#include <math.h>
+
+#define FPU_DOUBLE(var) double var; \
+	__asm__ __volatile__( "fstpl %0;fwait" : "=m" (var) : )
+#define FPU_DOUBLES(var1,var2) double var1,var2; \
+	__asm__ __volatile__( "fstpl %0;fwait" : "=m" (var2) : ); \
+	__asm__ __volatile__( "fstpl %0;fwait" : "=m" (var1) : )
+
+/*
+ * @implemented
+ */
+double	CDECL	_CIsin(void)
+{
+	FPU_DOUBLE(x);
+	return sin(x);
+}
+/*
+ * @implemented
+ */
+double	CDECL	_CIcos(void)
+{
+	FPU_DOUBLE(x);
+	return cos(x);
+}
+/*
+ * @implemented
+ */
+double	CDECL	_CItan(void)
+{
+	FPU_DOUBLE(x);
+	return tan(x);
+}
+/*
+ * @implemented
+ */
+double	CDECL	_CIsinh(void)
+{
+	FPU_DOUBLE(x);
+	return sinh(x);
+}
+/*
+ * @implemented
+ */
+double	CDECL	_CIcosh(void)
+{
+	FPU_DOUBLE(x);
+	return cosh(x);
+}
+/*
+ * @implemented
+ */
+double	CDECL	_CItanh(void)
+{
+	FPU_DOUBLE(x);
+	return tanh(x);
+}
+/*
+ * @implemented
+ */
+double	CDECL	_CIasin(void)
+{
+	FPU_DOUBLE(x);
+	return asin(x);
+}
+/*
+ * @implemented
+ */
+double	CDECL	_CIacos(void)
+{
+	FPU_DOUBLE(x);
+	return acos(x);
+}
+/*
+ * @implemented
+ */
+double	CDECL	_CIatan(void)
+{
+	FPU_DOUBLE(x);
+	return atan(x);
+}
+/*
+ * @implemented
+ */
+double	CDECL	_CIatan2(void)
+{
+	FPU_DOUBLES(x, y);
+	return atan2(x, y);
+}
+/*
+ * @implemented
+ */
+double	CDECL	_CIexp(void)
+{
+	FPU_DOUBLE(x);
+	return exp(x);
+}
+/*
+ * @implemented
+ */
+double	CDECL	_CIlog(void)
+{
+	FPU_DOUBLE(x);
+	return log(x);
+}
+/*
+ * @implemented
+ */
+double	CDECL	_CIlog10(void)
+{
+	FPU_DOUBLE(x);
+	return log10(x);
+}
+/*
+ * @implemented
+ */
+double	CDECL	_CIpow(void)
+{
+	FPU_DOUBLES(x, y);
+	return pow(x, y);
+}
+/*
+ * @implemented
+ */
+double	CDECL	_CIsqrt(void)
+{
+	FPU_DOUBLE(x);
+	return sqrt(x);
+}
+/*
+ * @implemented
+ */
+double	CDECL	_CIfmod(void)
+{
+	FPU_DOUBLES(x, y);
+	return fmod(x, y);
+}
diff --git a/reactos/lib/sdk/crt/math/stubs.c b/reactos/lib/sdk/crt/math/stubs.c
index 58fac7113c0..271807fb9f5 100644
--- a/reactos/lib/sdk/crt/math/stubs.c
+++ b/reactos/lib/sdk/crt/math/stubs.c
@@ -1,138 +1,134 @@
 #include <precomp.h>
 #include <math.h>
 
-#define FPU_DOUBLE(var) double var; \
-	__asm__ __volatile__( "fstpl %0;fwait" : "=m" (var) : )
-#define FPU_DOUBLES(var1,var2) double var1,var2; \
-	__asm__ __volatile__( "fstpl %0;fwait" : "=m" (var2) : ); \
-	__asm__ __volatile__( "fstpl %0;fwait" : "=m" (var1) : )
+double CDECL _CIsin(double x);
+double CDECL _CIcos(double x);
+double CDECL _CItan(double x);
+double CDECL _CIsinh(double x);
+double CDECL _CIcosh(double x);
+double CDECL _CItanh(double x);
+double CDECL _CIasin(double x);
+double CDECL _CIacos(double x);
+double CDECL _CIatan(double x);
+double CDECL _CIatan2(double y, double x);
+double CDECL _CIexp(double x);
+double CDECL _CIlog(double x);
+double CDECL _CIlog10(double x);
+double CDECL _CIpow(double x, double y);
+double CDECL _CIsqrt(double x);
+double CDECL _CIfmod(double x, double y);
+
 
 /*
  * @implemented
  */
-double	CDECL	_CIsin(void)
+double	CDECL	_CIsin(double x)
 {
-	FPU_DOUBLE(x);
 	return sin(x);
 }
 /*
  * @implemented
  */
-double	CDECL	_CIcos(void)
+double	CDECL	_CIcos(double x)
 {
-	FPU_DOUBLE(x);
 	return cos(x);
 }
 /*
  * @implemented
  */
-double	CDECL	_CItan(void)
+double	CDECL	_CItan(double x)
 {
-	FPU_DOUBLE(x);
 	return tan(x);
 }
 /*
  * @implemented
  */
-double	CDECL	_CIsinh(void)
+double	CDECL	_CIsinh(double x)
 {
-	FPU_DOUBLE(x);
 	return sinh(x);
 }
 /*
  * @implemented
  */
-double	CDECL	_CIcosh(void)
+double	CDECL	_CIcosh(double x)
 {
-	FPU_DOUBLE(x);
 	return cosh(x);
 }
 /*
  * @implemented
  */
-double	CDECL	_CItanh(void)
+double	CDECL	_CItanh(double x)
 {
-	FPU_DOUBLE(x);
 	return tanh(x);
 }
 /*
  * @implemented
  */
-double	CDECL	_CIasin(void)
+double	CDECL	_CIasin(double x)
 {
-	FPU_DOUBLE(x);
 	return asin(x);
 }
 /*
  * @implemented
  */
-double	CDECL	_CIacos(void)
+double	CDECL	_CIacos(double x)
 {
-	FPU_DOUBLE(x);
 	return acos(x);
 }
 /*
  * @implemented
  */
-double	CDECL	_CIatan(void)
+double	CDECL	_CIatan(double x)
 {
-	FPU_DOUBLE(x);
 	return atan(x);
 }
 /*
  * @implemented
  */
-double	CDECL	_CIatan2(void)
+double	CDECL	_CIatan2(double x, double y)
 {
-	FPU_DOUBLES(x, y);
-	return atan2(x, y);
+	return atan2(y, x);
 }
 /*
  * @implemented
  */
-double	CDECL	_CIexp(void)
+double	CDECL	_CIexp(double x)
 {
-	FPU_DOUBLE(x);
 	return exp(x);
 }
 /*
  * @implemented
  */
-double	CDECL	_CIlog(void)
+double	CDECL	_CIlog(double x)
 {
-	FPU_DOUBLE(x);
 	return log(x);
 }
 /*
  * @implemented
  */
-double	CDECL	_CIlog10(void)
+double	CDECL	_CIlog10(double x)
 {
-	FPU_DOUBLE(x);
 	return log10(x);
 }
 /*
  * @implemented
  */
-double	CDECL	_CIpow(void)
+double	CDECL	_CIpow(double x, double y)
 {
-	FPU_DOUBLES(x, y);
 	return pow(x, y);
 }
 /*
  * @implemented
  */
-double	CDECL	_CIsqrt(void)
+double	CDECL	_CIsqrt(double x)
 {
-	FPU_DOUBLE(x);
 	return sqrt(x);
 }
 /*
  * @implemented
  */
-double	CDECL	_CIfmod(void)
+double	CDECL	_CIfmod(double x, double y)
 {
-	FPU_DOUBLES(x, y);
 	return fmod(x, y);
 }