In mathematics, the trigonometric functions (also called the circular functions) are functions of an angle. They relate the angles of a triangle to the lengths of its sides. Trigonometric functions are important in the study of triangles and modeling periodic phenomena, among many other applications.
Yellow stool is typically due to an excess of fatty foods and grease in the diet. Mayo Clinic states that it can also be caused by a malabsorption disorder such as celiac disease.
Prolonged yellow stool may also be caused by conditions such as giardiasis or gastroesophageal reflux disease (GERD). Yellow stool may also indicate problems with the gallbladder and liver. Bile salts from the liver give stool its brownish color and when bile output is diminished, it may first appear as yellow stool.