x-02+y-22=12y+41
⇒x2+y2+4-4y=14y2+16+8y
⇒4x2+4y2-16y+16= y2+8y+16
⇒4x2+3y2-24y=0
4x2+3(y2-8y+42) =48
⇒x212+y-4242=1 এখানে, 42>12
অতএব, উপকেন্দ্রিক দৈর্ঘ্য =2×124=6 একক
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