表达式1: negative 2sine left parenthesis, StartFraction, "x" minus StartAbsoluteValue, "x" , EndAbsoluteValue Over 2 , EndFraction , right parenthesis−2sinx−x2
1
表达式2: sine left parenthesis, StartAbsoluteValue, "x" , EndAbsoluteValue , right parenthesis minus sine "x"sinx−sinx