表达式5: left parenthesis, "x" minus "x" Subscript, 1 , Baseline sin left parenthesis, "t" Subscript, 1 , Baseline , right parenthesis , right parenthesis squared plus left parenthesis, "y" minus "y" Subscript, 1 , Baseline , right parenthesis squared equals 1x−x1sint12+y−y12=1
5
表达式6: left parenthesis, "x" Subscript, 1 , Baseline plus cos left parenthesis, 30 "t" Subscript, 1 , Baseline , right parenthesis , "y" Subscript, 1 , Baseline plus sin left parenthesis, 30 "t" Subscript, 1 , Baseline , right parenthesis , right parenthesisx1+cos30t1,y1+sin30t1
6
表达式7: left parenthesis, 1 plus "x" Subscript, 1 , Baseline plus cos left parenthesis, 30 "t" Subscript, 1 , Baseline , right parenthesis , 1 plus "y" Subscript, 1 , Baseline plus sin left parenthesis, 30 "t" Subscript, 1 , Baseline , right parenthesis , right parenthesis1+x1+cos30t1,1+y1+sin30t1
7
表达式8: left parenthesis, negative 1 plus "x" Subscript, 1 , Baseline plus cos left parenthesis, 30 "t" Subscript, 1 , Baseline , right parenthesis , 1 plus "y" Subscript, 1 , Baseline plus sin left parenthesis, 30 "t" Subscript, 1 , Baseline , right parenthesis , right parenthesis−1+x1+cos30t1,1+y1+sin30t1
8
表达式9: left parenthesis, "x" Subscript, 1 , Baseline plus cos left parenthesis, 30 "t" Subscript, 1 , Baseline , right parenthesis , 2 plus "y" Subscript, 1 , Baseline plus sin left parenthesis, 30 "t" Subscript, 1 , Baseline , right parenthesis , right parenthesisx1+cos30t1,2+y1+sin30t1