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.
Tan colored stools suggest you may have difficulty digesting your fats, which causes congestion in the liver and gall bladder. IBS and yellow stools sometimes occur. Gray/white ashy colored or clay like stools can indicate pancreas or liver problems. Also, possibly gallstones pancreatitis or cirrhosis of the liver.