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Both are double.

Cosine Documentation

Here is some of the documentation (find this on the Web with a search for "Java cos"):

Class Math



public static double cos(double a)

Returns the trigonometric cosine of an angle.

cos is a static function of the class Math, which is found in the java.lang package. Classes from that package (such as String and Math) are so common that you do not have to import the package. The angle a is a double and must be expressed in radians. The return value is a double.


(Math Review: ) Can angles in radian mesure be converted to degrees?