1)
3 3 3
1 3
x
x x x
1
1 1 1
=
1 2 2
e x x x
1 1 sin( 1) 1
lim lim lim lim
2 2
1 1 1 os( 1) 1
x x x c x x
3 3
x x x x
1 1 1 1
1 2
1 sin( 1)
e x
3 2 3 3 2 3
lim lim 1 lim lim 1 1 3 6 9
x x x x x
1 1 os( 1)
x x c x
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