" "
n(n2-1)
2n2 - 3 cos(3n)
a) , b) (-1)n · .
2n2 + 1 n!
n=1 n=1
x3
f(x) = .
(x - 1)2
a " R b " R
Å„Å‚
xsin x, x > 0
òÅ‚
f(x) = a, x = 0
ół
b x ctg2x, x " (-Ä„ , 0)
6
x = 0
x2
x-5
f(x) = e .
1 e3x
a) arctgx dx, b) " dx.
4
x2
ex + 1