Avaldis 4: "a" Start sum from "n" equals 1 to 30, end sum, StartFraction, left parenthesis, negative 1 , right parenthesis Superscript, 1 plus "n" , Baseline sin left parenthesis, "f" left parenthesis, 2 "n" minus 1 , right parenthesis "x" , right parenthesis Over left parenthesis, 2 "n" minus 1 , right parenthesis squared , EndFractiona30∑n=1−11+nsinf2n−1x2n−12
