表达式15: left parenthesis, "R" cos "t" , "R" sin "t" , right parenthesisRcost,Rsint
00
定义域t最小值：
less than or equal to "t" less than or equal to≤t≤
定义域t最大值： 180180
15
表达式16: left parenthesis, "R" cos "t" , "R" sin 0 , right parenthesisRcost,Rsin0
00
定义域t最小值：
less than or equal to "t" less than or equal to≤t≤
定义域t最大值： 180180
16
表达式17: left parenthesis, "N" Subscript, 1 , Baseline plus "R" Subscript, 2 , Baseline cos "t" , "N" Subscript, 2 , Baseline plus "R" Subscript, 2 , Baseline sin "t" , right parenthesisN1+R2cost,N2+R2sint
00
定义域t最小值：
less than or equal to "t" less than or equal to≤t≤
定义域t最大值： 360360
17
表达式18: left parenthesis, "M" Subscript, 1 , Baseline plus "R" Subscript, 3 , Baseline cos "t" , "M" Subscript, 2 , Baseline plus "R" Subscript, 3 , Baseline sin "t" , right parenthesisM1+R3cost,M2+R3sint
00
定义域t最小值：
less than or equal to "t" less than or equal to≤t≤
