/... ......Moving pointFind ......Lengh of arc
(09-23-2014), (09-22-2014), (09-22-2014), (09-26-2014)
n=0 or1 or 2
(09-23-2014), (09-22-2014), (09-26-2014), (09-22-2014)
n=0 or1 or 2 /
solve ...... (2) (2)Prove that
n=1 n=2 3 23. 2.478
() ()
: 1 (0 1 )
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