View of comedian and actor Bill Cosby in a scene from "The Bill Cosby Show." Cosby holds a mathematics textbook and stands at blackboard. Label on back: "NBC Color Television. Exclusive to you in your area. The mathematician. Coach Chet Kincaid (Bill Cosby), assigned to substitute in algebra during the regular teacher's illness, discovers what a mistake it is to depend on an answer book with missing pages in "Let X equal a lousy weekend' colorcast on NBC-TV's "The Bill Cosby Show," Sunday, Oct. 26 (8:30-9 p.m. EST & PST; 7:30-8 p.m. C.S.T.)"
