less than or equal to theta less than or equal to≤θ≤
2 pi2π
定义域\theta最大值：
7
表达式8: "x" equals negative 1 left brace, negative 20 less than or equal to "y" less than or equal to negative 6.3 6 , right bracex=−1−20≤y≤−6.36
8
表达式9: "x" equals 1 left brace, negative 20 less than or equal to "y" less than or equal to negative 6.3 6 , right bracex=1−20≤y≤−6.36
9
表达式10: "y" equals negative 20 left brace, negative 5 less than "x" less than 5 , right bracey=−20−5<x<5
10
表达式11: "x" squared plus left parenthesis, "y" plus 20 , right parenthesis squared equals 25 left brace, negative 25 less than or equal to "y" less than or equal to negative 20 , right bracex2+y+202=25−25≤y≤−20
11
表达式12: "r" equals sine "a" thetar=sinaθ
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：
12
表达式13: "a" equals 5.4 3a=5.43
33
77
13
表达式14: "r" equals "a"r=a
00
定义域\theta最小值：
less than or equal to theta less than or equal to≤θ≤
