表达式1: left parenthesis, tan left parenthesis, StartFraction, pi Over 3 , EndFraction plus 1 third arctan left parenthesis, abs left parenthesis, "x" , right parenthesis , right parenthesis , right parenthesis , right parenthesis squaredtanπ3+13arctanabsx2
1
表达式2: 2 plus 3 "x" squared plus 2 StartRoot, left parenthesis, "x" squared plus 1 , right parenthesis , EndRoot StartRoot, left parenthesis, 9 "x" squared plus 1 , right parenthesis , EndRoot cosine left parenthesis, 1 third arctan left parenthesis, StartFraction, 8abs left parenthesis, "x" , right parenthesis Over 27 "x" to the 4th power plus 18 "x" squared minus 1 , EndFraction , right parenthesis , right parenthesis2+3x2+2x2+19x2+1cos13arctan8absx27x4+18x2−1