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Question Number 89558 by peter frank last updated on 17/Apr/20

S h o w t h a t d i f f e r e n c e

o f t h e f o c u s d i s t a n c e

o f a n y p o i n t o n h y p e r b o l a

i s e q u a l t o t h e l e n g t h o f

t h e t r a n v e r s e d a x i s