求极限lim(t→x)(sint/sinx)^(x/sint-sinx)
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求极限lim(t→x)(sint/sinx)^(x/sint-sinx)
是 (sint/sinx)^[x/(sint-sinx)]吧,否则极限是否存在值得怀疑
e^ln(sint/sinx)^[x/(sint-sinx)] = e^{[x/(sint-sinx)] [ln(sint)-ln(sinx)]}
{[x/(sint-sinx)] [ln(sint)-ln(sinx)]} = x(lnsint-lnsinx)/(sint-sinx)
分子分母都趋于0,因此适用罗比达法则,分别对t求导得到
[xcost/sint ]/cost =x/sinx
所以原来式子的极限为e^(x/sinx)
再问: 谢谢,
e^ln(sint/sinx)^[x/(sint-sinx)] = e^{[x/(sint-sinx)] [ln(sint)-ln(sinx)]}
{[x/(sint-sinx)] [ln(sint)-ln(sinx)]} = x(lnsint-lnsinx)/(sint-sinx)
分子分母都趋于0,因此适用罗比达法则,分别对t求导得到
[xcost/sint ]/cost =x/sinx
所以原来式子的极限为e^(x/sinx)
再问: 谢谢,
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