lim x mendekati 0 (sin x) / x = 1 , maka lim mendekati 1 (1-x²) / sin π - πx) adalah..

(1 - x²) / sin(π - πx)
= (1 - x)(1 + x) / sinπ(1 - x)
= (1 + x) / sinπ
= (1 + 1) / 0
= 2/0
= 0