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+.. _lang-cos:
+
+cos()
+=====
+
+Calculates the cosine of an angle.
+
+Library Documentation
+---------------------
+
+.. doxygenfunction:: cos
+
+Arduino Compatibility
+---------------------
+
+The Maple ``cos()`` implementation is compatible with Arduino.
+
+Note that the Maple implementation comes from `newlib
+<http://sourceware.org/newlib/>`_\ , while Arduino's is that of
+`avr-libc <http://avr-libc.nongnu.org/>`_\ .
+
+See Also
+--------
+
+-  :ref:`sin() <lang-sin>`
+-  :ref:`tan() <lang-tan>`
+-  :ref:`float <lang-float>`
+-  :ref:`double <lang-double>`
+
+.. include:: /arduino-cc-attribution.txt