diff --git a/src/blaze/env/environment.cpp b/src/blaze/env/environment.cpp
index 3d96aaa..681a361 100644
--- a/src/blaze/env/environment.cpp
+++ b/src/blaze/env/environment.cpp
@@ -88,6 +88,7 @@ void Environment::loadFunctions()
 	loadCompare();
 	loadConvert();
 	loadFormat();
+	loadMath();
 	loadMeta();
 	loadMutable();
 	loadOperators();
diff --git a/src/blaze/env/environment.h b/src/blaze/env/environment.h
index 4bcda6d..e31211e 100644
--- a/src/blaze/env/environment.h
+++ b/src/blaze/env/environment.h
@@ -51,6 +51,7 @@ private:
 	static void loadCompare();
 	static void loadConvert();
 	static void loadFormat();
+	static void loadMath();
 	static void loadMeta();
 	static void loadMutable();
 	static void loadOperators();
diff --git a/src/blaze/env/functions/math.cpp b/src/blaze/env/functions/math.cpp
new file mode 100644
index 0000000..a281ba1
--- /dev/null
+++ b/src/blaze/env/functions/math.cpp
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2023 Riyyi
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <cmath>  // std::sin
+#include <limits> // sdt::numeric_limits
+#include <memory> // std::static_pointer_cast
+
+#include "blaze/ast.h"
+#include "blaze/env/macro.h"
+#include "blaze/util.h"
+
+namespace blaze {
+
+void Environment::loadMath()
+{
+#define MATH_MAX_MIN(variant, limit, operator)                                       \
+	{                                                                                \
+		CHECK_ARG_COUNT_AT_LEAST(#variant, SIZE(), 1);                               \
+                                                                                     \
+		int64_t number = std::numeric_limits<int64_t>::limit();                      \
+		double decimal = std::numeric_limits<double>::limit();                       \
+                                                                                     \
+		for (auto it = begin; it != end; ++it) {                                     \
+			IS_VALUE(Numeric, (*it));                                                \
+			if (is<Number>(it->get())) {                                             \
+				auto it_numeric = std::static_pointer_cast<Number>(*it)->number();   \
+				if (it_numeric operator number) {                                    \
+					number = it_numeric;                                             \
+				}                                                                    \
+			}                                                                        \
+			else {                                                                   \
+				auto it_numeric = std::static_pointer_cast<Decimal>(*it)->decimal(); \
+				if (it_numeric operator decimal) {                                   \
+					decimal = it_numeric;                                            \
+				}                                                                    \
+			}                                                                        \
+		}                                                                            \
+                                                                                     \
+		if (number operator decimal) {                                               \
+			return makePtr<Number>(number);                                          \
+		}                                                                            \
+                                                                                     \
+		return makePtr<Decimal>(decimal);                                            \
+	}
+
+	ADD_FUNCTION(
+		"max", "number...",
+		"Return largest of all arguments, where NUMBER is a number or decimal.",
+		MATH_MAX_MIN(max, lowest, >));
+	ADD_FUNCTION(
+		"min", "number...",
+		"Return smallest of all arguments, where NUMBER is a number or decimal.",
+		MATH_MAX_MIN(min, max, <));
+
+#define MATH_COS_SIN(variant)                                                                                 \
+	{                                                                                                         \
+		CHECK_ARG_COUNT_IS(#variant, SIZE(), 1);                                                              \
+                                                                                                              \
+		auto value = *begin;                                                                                  \
+		IS_VALUE(Numeric, value);                                                                             \
+		if (is<Number>(begin->get())) {                                                                       \
+			return makePtr<Decimal>(std::variant((double)std::static_pointer_cast<Number>(value)->number())); \
+		}                                                                                                     \
+                                                                                                              \
+		return makePtr<Decimal>(std::variant(std::static_pointer_cast<Decimal>(value)->decimal()));           \
+	}
+
+	ADD_FUNCTION(
+		"cos", "arg",
+		"Return the cosine of ARG.",
+		MATH_COS_SIN(cos));
+
+	ADD_FUNCTION(
+		"sin", "arg",
+		"Return the sine of ARG.",
+		MATH_COS_SIN(sin));
+}
+
+} // namespace blaze
diff --git a/src/blaze/env/functions/other.cpp b/src/blaze/env/functions/other.cpp
index 7e99d11..5a16127 100644
--- a/src/blaze/env/functions/other.cpp
+++ b/src/blaze/env/functions/other.cpp
@@ -4,8 +4,11 @@
  * SPDX-License-Identifier: MIT
  */
 
-#include <chrono>  // std::chrono::sytem_clock
-#include <cstdint> // int64_t
+#include <chrono>     // std::chrono::sytem_clock
+#include <cstdint>    // int64_t
+#include <filesystem> // std::filesystem::current_path
+
+#include "ruc/file.h"
 
 #include "blaze/ast.h"
 #include "blaze/env/macro.h"
@@ -17,10 +20,35 @@ namespace blaze {
 
 void Environment::loadOther()
 {
+	ADD_FUNCTION(
+		"pwd", "",
+		"Return the full filename of the current working directory.",
+		{
+			CHECK_ARG_COUNT_IS("pwd", SIZE(), 0);
+
+			auto path = std::filesystem::current_path().string();
+			return makePtr<String>(path);
+		});
+
+	ADD_FUNCTION(
+		"slurp", "",
+		"Read file contents",
+		{
+			CHECK_ARG_COUNT_IS("slurp", SIZE(), 1);
+
+			VALUE_CAST(node, String, (*begin));
+			std::string path = node->data();
+
+			auto file = ruc::File(path);
+
+			return makePtr<String>(file.data());
+		});
+
+	// -----------------------------------------
+
 	// (throw x)
 	ADD_FUNCTION(
-		"throw",
-		"",
+		"throw", "",
 		"",
 		{
 			CHECK_ARG_COUNT_IS("throw", SIZE(), 1);
@@ -34,8 +62,7 @@ void Environment::loadOther()
 
 	// (time-ms)
 	ADD_FUNCTION(
-		"time-ms",
-		"",
+		"time-ms", "",
 		"",
 		{
 			CHECK_ARG_COUNT_IS("time-ms", SIZE(), 0);
diff --git a/src/blaze/env/functions/repl.cpp b/src/blaze/env/functions/repl.cpp
index 36dd6c4..499bb54 100644
--- a/src/blaze/env/functions/repl.cpp
+++ b/src/blaze/env/functions/repl.cpp
@@ -6,8 +6,6 @@
 
 #include <string>
 
-#include "ruc/file.h"
-
 #include "blaze/ast.h"
 #include "blaze/env/macro.h"
 #include "blaze/repl.h"
@@ -31,22 +29,6 @@ void Environment::loadRepl()
 			return Repl::read(input);
 		});
 
-	// Read file contents
-	ADD_FUNCTION(
-		"slurp",
-		"",
-		"",
-		{
-			CHECK_ARG_COUNT_IS("slurp", SIZE(), 1);
-
-			VALUE_CAST(node, String, (*begin));
-			std::string path = node->data();
-
-			auto file = ruc::File(path);
-
-			return makePtr<String>(file.data());
-		});
-
 	// Prompt readline
 	ADD_FUNCTION(
 		"readline",