表达式4: "y" squared plus "x" squared equals 2y2+x2=2
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表达式5: "y" squared minus "x" squared equals 2y2−x2=2
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表达式6: StartRoot, 2 , EndRoot "z" Subscript, "m" "u" "l" , Baseline left parenthesis, "z" Subscript, "u" "c" "a" , Baseline left parenthesis, StartFraction, pi Over 4 , EndFraction , right parenthesis , left parenthesis, "t" , StartRoot, "t" squared minus 1 , EndRoot , right parenthesis , right parenthesis2zmulzucaπ4,t,t2−1
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表达式7: StartRoot, 2 , EndRoot left parenthesis, "t" , StartRoot, "t" squared minus 1 , EndRoot , right parenthesis2t,t2−1
