表达式3: "r" equals StartFraction, 1 Over "a" , EndFractionr=1a
00
定义域\theta最小值：
less than or equal to theta less than or equal to≤θ≤
12 pi12π
定义域\theta最大值：
equals=
0.2 0 6 9 6 9 0 7 2 2 5 60.206969072256
3
表达式4: left parenthesis, mod left parenthesis, "x" , 2 "L" , right parenthesis minus StartFraction, "L" Over 2 , EndFraction minus "r" sin left parenthesis, StartFraction, "a" Over 2 , EndFraction , right parenthesis , right parenthesis squared plus left parenthesis, "y" plus "r" cos left parenthesis, StartFraction, "a" Over 2 , EndFraction , right parenthesis , right parenthesis squared equals "r" squared left brace, "y" greater than 0 , right bracemodx,2L−L2−rsina22+y+rcosa22=r2y>0
4
表达式5: left parenthesis, mod left parenthesis, "x" plus "L" , 2 "L" , right parenthesis minus StartFraction, "L" Over 2 , EndFraction minus "r" sin left parenthesis, StartFraction, "a" Over 2 , EndFraction , right parenthesis , right parenthesis squared plus left parenthesis, "y" minus "r" cos left parenthesis, StartFraction, "a" Over 2 , EndFraction , right parenthesis , right parenthesis squared equals "r" squared left brace, "y" less than 0 , right bracemodx+L,2L−L2−rsina22+y−rcosa22=r2y<0
