diff --git a/config/rel_slices.yml b/config/rel_slices.yml
index ab32463a..6b2ebe89 100644
--- a/config/rel_slices.yml
+++ b/config/rel_slices.yml
@@ -50,9 +50,9 @@ m_malloc.c:
 m_mail_password_check.c:
     .text: [0x803BD250, 0x803BEC9C]
     .data: [0x806566C0, 0x806571D8]
-#m_lib.c: #sqrtf statics
-#    .text: [0x803BAB0C, 0x803BB960]
-#    .rodata: [0x80642640, 0x80642680]
+m_lib.c:
+    .text: [0x803BAB0C, 0x803BB960]
+    .rodata: [0x80642640, 0x80642680]
 m_mushroom.c:
     .text: [0x803C8090, 0x803C90A8]
     .rodata: [0x80642950, 0x80642960]
diff --git a/include/libc/math.h b/include/libc/math.h
index ef3eff40..a0427698 100644
--- a/include/libc/math.h
+++ b/include/libc/math.h
@@ -8,6 +8,7 @@
 #define M_PI 3.14159265358979323846f
 
 s16 sins(u16);
+s16 coss(u16);
 
 f32 fatan2(f32, f32);
 
diff --git a/include/libultra/libultra.h b/include/libultra/libultra.h
index 32c32e3a..5e5c8cc4 100644
--- a/include/libultra/libultra.h
+++ b/include/libultra/libultra.h
@@ -10,6 +10,7 @@
 #include "libultra/os_timer.h"
 #include "libultra/os_thread.h"
 #include "libultra/initialize.h"
+#include "libc/math.h" /* TODO: sins and coss belong in libultra */
 
 #define N64_SCREEN_HEIGHT 240
 #define N64_SCREEN_WIDTH 320
diff --git a/include/sys_math3d.h b/include/sys_math3d.h
index 3038e3df..cee44a56 100644
--- a/include/sys_math3d.h
+++ b/include/sys_math3d.h
@@ -1,5 +1,5 @@
-#ifndef SYS_MATH_H
-#define SYS_MATH_H
+#ifndef SYS_MATH3D_H
+#define SYS_MATH3D_H
 
 #include "types.h"
 #include "m_lib.h"
@@ -8,6 +8,8 @@
 extern "C" {
 #endif
 
+extern f32 Math3DVecLength(xyz_t* vec);
+
 extern xyz_t ZeroVec;
 
 #ifdef __cplusplus
diff --git a/include/sys_matrix.h b/include/sys_matrix.h
index bd0196fd..22dfc35b 100644
--- a/include/sys_matrix.h
+++ b/include/sys_matrix.h
@@ -21,8 +21,8 @@ extern void new_Matrix(GAME* game);
 
 extern void Matrix_softcv3_mult(xyz_t* src, s_xyz* dest);
 extern Mtx* _MtxF_to_Mtx(MtxF* src, Mtx* dest);
-
-
+extern void Matrix_mult(MtxF* m, s8 flag);
+extern void Matrix_Position(xyz_t* wpos, xyz_t* screen_pos);
 
 #ifdef __cplusplus
 }
diff --git a/rel/m_lib.c b/rel/m_lib.c
index df15d90d..1aa98d43 100644
--- a/rel/m_lib.c
+++ b/rel/m_lib.c
@@ -47,7 +47,12 @@
 #include "m_actor.h"
 #include "m_play.h"
 #include "main.h"
+#include "libultra/libultra.h"
 #include "MSL_C/w_math.h"
+#include "libc64/qrand.h"
+#include "sys_matrix.h"
+#include "sys_math.h"
+#include "sys_math3d.h"
 
 /**
  * @brief Copy memory from the source buffer to the destination buffer.