Both the sums are lengthy and ate from surface area and volume

I n   f i g u r e ,   O   i s   t h e   c e n t r e   o f   t h e   c i r c l e ,   t h e   v a l u e   o f   x   +   y   -   z   =   _ _ _ _ _ _ .

 
B i s e c t o r s   o f   a n g l e s   A ,   B   a n d   C   o f   a   t r i a n g l e   A B C i n t e r s e c t   i t s   c i r c u m c i r c l e   a t   D ,   E   a n d   F   r e s p e c t i v e l y .   T h e   v a l u e   o f   D E F   i n   t e r m s   o f   A ,   B   a n d   C   i s   _ _ _ _ _ _ _ _   .  

Sorry both sums are from cicle chapters
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1st solution
  • 2
solution 1st

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