表达式3: "y" Subscript, 2 , Baseline equals "y" Subscript, 1 , Baseline cosine alpha minus "x" Subscript, 1 , Baseline sine alphay2=y1cosα−x1sinα
3
表达式4: alpha equals 2.6 7α=2.67
4
表达式5: "y" Subscript, 2 , Baseline tilde "a" "x" squared plus "b" "x" Subscript, 2 , Baseline plus "c"y2~ax22+bx2+c
5
表达式6: left parenthesis, "t" cos alpha minus left parenthesis, "a" "t" squared plus "b" "t" plus "c" , right parenthesis sin alpha , left parenthesis, "a" "t" squared plus "b" "t" plus "c" , right parenthesis cos alpha plus "t" sin alpha , right parenthesistcosα−at2+bt+csinα,at2+bt+ccosα+tsinα
