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4、原式=lim(x->0) e^x*[e^(tanx-x)-1]/x^3
=lim(x->0) (tanx-x)/x^3
=lim(x->0) (sec^2x-1)/3x^2
=lim(x->0) tan^2x/3x^2
=lim(x->0) x^2/3x^2
=1/3
5、原式=lim(x->0) e^(2-2cosx)*[e^(x^2-2+2cosx)-1]/x^4
=lim(x->0) (x^2-2+2cosx)/x^4
=lim(x->0) (2x-2sinx)/4x^3
=lim(x->0) (x-sinx)/2x^3
=lim(x->0) (1-cosx)/6x^2
=lim(x->0) (x^2/2)/6x^2
=1/12
=lim(x->0) (tanx-x)/x^3
=lim(x->0) (sec^2x-1)/3x^2
=lim(x->0) tan^2x/3x^2
=lim(x->0) x^2/3x^2
=1/3
5、原式=lim(x->0) e^(2-2cosx)*[e^(x^2-2+2cosx)-1]/x^4
=lim(x->0) (x^2-2+2cosx)/x^4
=lim(x->0) (2x-2sinx)/4x^3
=lim(x->0) (x-sinx)/2x^3
=lim(x->0) (1-cosx)/6x^2
=lim(x->0) (x^2/2)/6x^2
=1/12
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