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1 5 x 1 x5
2 x 1 2 x 3 3 1
lim
lim 1
x 2 x 3 x 2 x 3
1 5 x 2 x 3 4 x51
4 4 4 2 x 3
lim 1 lim 1
x 2 x 3 x 2 x 3
4 20x 4
x51 10
lim e 2 x 3 lim e 2x 3 e .
x x