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展开全部
x->0
cosx = 1- (1/2)x^2 +o(x^2)
lim(x->0) (cosx)^(4/x^2)
=lim(x->0) [ 1- (1/2)x^2 ]^(4/x^2)
=e^(-2)
cosx = 1- (1/2)x^2 +o(x^2)
lim(x->0) (cosx)^(4/x^2)
=lim(x->0) [ 1- (1/2)x^2 ]^(4/x^2)
=e^(-2)
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展开全部
lim(x->0)(cosx)^(4/x^2) = lim(x->0)[1-(1-cosx)]^(4/x^2)
= lim(x->0){[1-(1-cosx)]^[-1/(1-cosx)]}^[-4(1-cosx)/x^2]
= e^lim(x->0)[-4(1-cosx)/x^2] = e^lim(x->0)(-2x^2/x^2) = e^(-2) = 1/e^2
= lim(x->0){[1-(1-cosx)]^[-1/(1-cosx)]}^[-4(1-cosx)/x^2]
= e^lim(x->0)[-4(1-cosx)/x^2] = e^lim(x->0)(-2x^2/x^2) = e^(-2) = 1/e^2
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