表达式30: "X" left parenthesis, "t" , right parenthesisXt
定义域t最小值： negative "T"−T
less than or equal to "t" less than or equal to≤t≤
11
定义域t最大值：
30
animation parameter
31
表达式32: "a" equals negative 1.3 6 4a=−1.364
negative "T"−T
11
32
draw sphere and ball (ball technically doesn't roll, or if it does, all its mass is concentrated at its centre)
33
表达式34: rho equals 0.0 4 3ρ=0.043
00
StartFraction, "R" Over 10 , EndFractionR10
34
表达式35: "r" less than or equal to "R" minus rhor≤R−ρ
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：
35
表达式36: left parenthesis, "R" minus rho , right parenthesis "t" left parenthesis, sin left parenthesis, theta Subscript, "C" , Baseline , right parenthesis , cos left parenthesis, theta Subscript, "C" , Baseline , right parenthesis , right parenthesisR−ρtsinθC,cosθC
00
定义域t最小值：
less than or equal to "t" less than or equal to≤t≤
11
定义域t最大值：
36
表达式37: left parenthesis, "x" minus "X" left parenthesis, "a" , right parenthesis . "x" , right parenthesis squared plus left parenthesis, "y" minus "X" left parenthesis, "a" , right parenthesis . "y" , right parenthesis squared less than or equal to rho squaredx−Xa.x2+y−Xa.y2≤ρ2
