表达式8: "r" equals negative StartFraction, 2 Over sin left parenthesis, theta , right parenthesis , EndFractionr=−2sinθ
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：
8
e)
9
表达式10: "r" equals StartFraction, 3 Over cos left parenthesis, theta , right parenthesis plus 4sin left parenthesis, theta , right parenthesis , EndFractionr=3cosθ+4sinθ
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：
10
f)
11
表达式12: "r" equals StartRoot, 2cos left parenthesis, 2 theta , right parenthesis , EndRootr=2cos2θ
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: "r" equals negative StartRoot, 2cos left parenthesis, 2 theta , right parenthesis , EndRootr=−2cos2θ
00
定义域\theta最小值：
less than or equal to theta less than or equal to≤θ≤
