表达式2: left parenthesis, StartFraction, 19 pi Over 8 , EndFraction , 0 , right parenthesis19π8,0
2
表达式3: 0.2 5 left parenthesis, sin left parenthesis, 4 thirds "x" minus StartFraction, 2 pi Over 3 , EndFraction , right parenthesis , right parenthesis minus 0.2 50.25sin43x−2π3−0.25