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u un=(A n = 0,

2+3∗un−1

A= 3

n > 0

n

X

i=1

i

Entier ×

Entiers →Entier

x=y

unu0= 1515 un+1 = 3un+ 42 n∈N∗

k uk

k uk

π

4=arctan(1) =

∞

X

n=0

(−1)n

2∗n+ 1

ε10−5

π ε

ε

n

n

X

i=1 

i

X

j=1

(i+j)≥1000

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