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c+1/c²-5c+6 . c-2/4c+4
(c+1)(c-2) / (c²-5c+6)(4c+4)
c²-2c+c-2 / 4c³+4c²-20c²-20c+24c+24
c²-c-2 / 4c³-16c²+4c+24
e.
a²-1/a+1 . a-1/a²-2a+1
(a²-1)(a-1) / (a+1)(a²-2a+1)
a³-a²-a+1 / a³-2a²+a+a²-2a+1
a³-a²-a+1 / a³-a²-a+1 = 1