表达式10: "x" sine "t" minus "y" cosine "t" equals 0 left brace, 180 less than or equal to "t" less than 270 , right brace left brace, "x" less than or equal to 0 , right brace left brace, "y" less than or equal to 0 , right bracexsint−ycost=0180≤t<270x≤0y≤0
10
表达式11: "x" sine "t" minus "y" cosine "t" equals 0 left brace, 270 less than or equal to "t" less than or equal to 360 , right brace left brace, "x" greater than or equal to 0 , right brace left brace, "y" less than or equal to 0 , right bracexsint−ycost=0270≤t≤360x≥0y≤0
11
表达式12: "y" equals "x" tangent "t" left brace, 0 less than "x" less than "a" , right brace left brace, "d" greater than 0 , right bracey=xtant0<x<ad>0
12
表达式13: "x" equals 0 left brace, 0 less than "y" less than "b" , right brace left brace, "t" equals 90 , right brace left brace, "d" greater than 0 , right bracex=00<y<bt=90d>0
未定义
13
表达式14: "y" equals "x" tangent "t" left brace, "a" less than "x" less than 0 , right brace left brace, "d" greater than 0 , right bracey=xtanta<x<0d>0
14
表达式15: "x" equals 0 left brace, "b" less than "y" less than 0 , right brace left brace, "t" equals 270 , right brace left brace, "d" greater than 0 , right bracex=0b<y<0t=270d>0
未定义
15
表达式16: "y" equals "x" tangent "t" left brace, 0 less than "x" less than "a" , right brace left brace, "d" less than 0 , right bracey=xtant0<x<ad<0
16
表达式17: "x" equals 0 left brace, 0 less than "y" less than "b" , right brace left brace, "t" equals 270 , right brace left brace, "d" less than 0 , right bracex=00<y<bt=270d<0
未定义
17
表达式18: "y" equals "x" tangent "t" left brace, "a" less than "x" less than 0 , right brace left brace, "d" less than 0 , right bracey=xtanta<x<0d<0
18
表达式19: "x" equals 0 left brace, "b" less than "y" less than 0 , right brace left brace, "t" equals 90 , right brace left brace, "d" less than 0 , right bracex=0b<y<0t=90d<0
