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(a)`(3-sqrt5)/2`(b)`(sqrt5-1)/2`(c)`(2-sqrt3)/(2)`(d)`(sqrt3-1)/2`

Answer :

A::BTranscript

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00:00 - 00:59 | hello students today occasion is a series of concentric lips E1 E2 E3 and n are drawn such that it touches the extremities of the major axis of E and -1 and the foci of N inside with the extremities of the minor axis of E and -1 if the central city of the ellipse is independent then the value of the recently City we have a b c d option is given here so we have to find which option is correct year so we can grow hair to lips that is one n -1 and S is even here so our first released this year and second ellipse is outside of it so we can draw it here for this is origin here 0 0 and B have the point |

01:00 - 01:59 | hair this is origin and receive e n 10 point then and there is point This is equals to a and this is equals to be this length is equals to 3 and -1 and this is N -1 and this length is be here so we have to ellipse BDS is equal to a dash and in the negative access we have a day so we have drawn the ellipse now we can solve the questions we can write B dash is equals to a and from here we can ride Bidar square is equal to the square and B have equal to 8 |

02:00 - 02:59 | Bidar square is equal to a square minus A square into a year and Square so we know that a dash is equals to be so we can write a square is equals to b square divided by 2 minus b square from here we can write square is equals to b square and this is divided by a square into 1 minus A square and this is equals to 1 minus C square whole square here so on solving this we get oneplus square is equals to plus minus and from here we can write |

03:00 - 03:59 | is equals to minus 1 + under root 5 / 2 or we can write is equal to under root 5 minus 1 divided by 24 this is our answer here so we check which option is correct option B is correct a thank you |