lim x趋于0 1-cosx^2/x^2sinX^2
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limx趋于01-cosx^2/x^2sinX^2limx趋于01-cosx^2/x^2sinX^2limx趋于01-cosx^2/x^2sinX^2(1-cosx^2)/x^2sinx^2=[1-1
lim x趋于0 1-cosx^2/x^2sinX^2
lim x趋于0 1-cosx^2/x^2sinX^2
lim x趋于0 1-cosx^2/x^2sinX^2
(1-cosx^2)/x^2sinx^2
=[1-1-2sin^2(x^2/2)]/x^2sinx^2
=2sin^2(x^2/2)/x^2sinx^2
=(x->0)2(x^2/2)^2/x^2*x^2=1/2
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