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lim x→0xcot2x的极限是多少
1个回答
2015-01-04
展开全部
lim(x->0)xcot(2x)
=lim(x->0)xcos(2x)/sin(2x)
=lim(x->0)cos(2x)*lim(x->0)x/sin(2x)
=(1)*lim(x->0)x/(2x)
=1/2
=lim(x->0)xcos(2x)/sin(2x)
=lim(x->0)cos(2x)*lim(x->0)x/sin(2x)
=(1)*lim(x->0)x/(2x)
=1/2
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