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第二步是怎么来的?(1-cosx^2)/x^2sinx^2①=[1-1-2sin^2(x^2/2)]/x^2sinx^2②=2sin^2(x^2/2)/x^2sinx^2③=(x->0)2
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