Trigonometric Functions: Mathematical functions that relate angles and sides of triangles.
Cosine (cos) Function: A trigonometric function that relates an angle in a right triangle to the ratio of the length of the adjacent side to the length of the hypotenuse.
Tangent (tan) Function: A trigonometric function that relates an angle in a right triangle to the ratio of the length of the opposite side to the length of the adjacent side.