Decompile coss

src/include/PR/gu.h

@@ -28,6 +28,7 @@ void guLookAt(Mtx *m, float xEye, float yEye, float zEye,
 		float xAt,  float yAt,  float zAt,
 		float xUp,  float yUp,  float zUp);
 
+signed short coss(unsigned short x);
 signed short sins(unsigned short x);
 
 /* Used only in Fast3DEX2 */

src/include/lib/lib_4f9b0.h

@@ -5,6 +5,5 @@
 #include "types.h"
 
 u32 func0004f9b0(void);
-u32 func0004fbc0(void);
 
 #endif