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+#ifndef INTERNAL_MATH_H /* -*- C -*- */
+#define INTERNAL_MATH_H
+/**
+ * @file
+ * @brief Internal header for Math.
+ * @author \@shyouhei
+ * @copyright This file is a part of the programming language Ruby.
+ * Permission is hereby granted, to either redistribute and/or
+ * modify this file, provided that the conditions mentioned in the
+ * file COPYING are met. Consult the file for details.
+ */
+
+/* math.c */
+VALUE rb_math_atan2(VALUE, VALUE);
+VALUE rb_math_cos(VALUE);
+VALUE rb_math_cosh(VALUE);
+VALUE rb_math_exp(VALUE);
+VALUE rb_math_hypot(VALUE, VALUE);
+VALUE rb_math_log(int argc, const VALUE *argv);
+VALUE rb_math_sin(VALUE);
+VALUE rb_math_sinh(VALUE);
+
+#endif /* INTERNAL_MATH_H */