1,= LIM(→3.14 / 2)cosx的/ [4sinx(2X - 3.14)]
= LIM(X→3.14 / 2)-sinx的/ [8sinx +4 cosx的(2X-3.14)] = -1/12
2,= LIM(X→3.14 / 2)(sinxcos3x)/ [cosx的sin3x的]
= LIM(X→3.14 / 2)(-cos3x/cosx) BR /> = LIM(X→3.14 / 2)(-3sin3x/sinx)
= 3
3,= LIM(X→0)(E ^ XX-1)/ [(E ^所述-1)]
= LIM(X→0)(E ^ X-1)/(E ^ X-1 + X * E ^)
= LIM(X→0)E ^ X / [E ^ X +(X +1)E ^]
= LIM(X→0)1 /(X +2)
= 1/2
4 = LIM (X→0 +)E ^(sinxlnx)
= LIM(X→0 +)E ^ [LNX /(1/sinx)
= LIM(X→0 +)E ^ [ - 罪^ 2 X /(X * cosx的)
= LIM(X→0 +)E ^(-sinx的)------- / *得到这个步骤,因为LIM(X→0)sinx的/ X = 1和LIM(X→0 +)1/cosx = 1。 * /
= LIM(X→0 +)E ^ 0
= 1
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