The cosine of 1328135 is:
-0.0021573577217343
Cosine belongs to the trigonometric functions of mathematics and is used among other things in geometry as a number.
The word cosine comes from Latin and is derived from "complementi sinus" - the complementary sine.
The cosine is used as a number, for example, in the triangle calculation of mathematics to calculate the complementary angle of the sine.