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.
Bright red stool usually suggests that blood is coming from the lower part of the digestive system, such as the large intestine, rectum or anus. Pale white or yellow stool also can mean a problem. The reason why stool is brown is because of our normal production of bile, Raufman said.