Answer 4.1:7
From Förberedande kurs i matematik 1
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			m  (Robot: Automated text replacement  (-{{:4.1 - Figur - Cirkeln x² + y² + 4y = 0}} +{{:4.1 - Figure - The circle x² + y² + 4y = 0}}))  | 
				m  (Robot: Automated text replacement  (-{{:4.1 - Figur - Cirkeln x² - 2x + y² + 6y = -3}} +{{:4.1 - Figure - The circle x² - 2x + y² + 6y = -3}}))  | 
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| - | {{:4.1 -   | + | {{:4.1 - Figure - The circle x² - 2x + y² + 6y = -3}}  | 
|d)  | |d)  | ||
| - | |width="50%" | {{:4.1 -   | + | |width="50%" | {{:4.1 - Figure - The circle x² - 2x + y² + 2y = -2}}  | 
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