How do you determine cosine values?

To determine the value of the cosine of an angle in a right triangle, divide the length of the side adjacent to the angle by the length of the hypotenuse. The hypotenuse of a right triangle is the side opposite to the right angle.

The cosine is one of the six basic trigonometric functions. It is the reciprocal function of the secant, which means that the cosine of an angle is equal to one divided by the secant of the angle. The cosine is related to the sine function by the Pythagorean theorem, which results in the cosine squared plus the sine squared being equal to one.