椭圆的形成 | Desmos

`P` left parenthesis, 5cos "a" , 3sin "a" , right parenthesis

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9

Expression 10: StartFraction, "x" squared Over 25 , EndFraction plus StartFraction, "y" squared Over 9 , EndFraction equals 1

10

`O` left parenthesis, 0 , 0 , right parenthesis

Label:

11

`A` left parenthesis, 5 , 0 , right parenthesis

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12

"x" Subscript, 4 , Baseline	"y" Subscript, 4 , Baseline
5cosine "a"	3sine "a"	r1c3:
3cosine "a"	3sine "a"	r2c3:
		r3c3:

13

Expression 14: "r" equals StartFraction, 1 Over 215 , EndFraction theta plus 0.5 left brace, 0 less than theta less than "a" , right brace

0

domain \theta Minimum:

less than or equal to theta less than or equal to

4.2

domain \theta Maximum:

14

`\phi` left parenthesis, 0.4 , 0.3 , right parenthesis

Label:

15

Expression 16: "y" equals 3 left brace, 5 less than or equal to "x" less than or equal to 6.5 , right brace

16

`旋转,看看！` left parenthesis, StartFraction, "a" Over 5 , EndFraction plus 5 , 3 , right parenthesis

Label:

17

18

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