此题 用洛必达法则求极限

网友回答

原式=limx→0 [2^(x/2)-2^(-x/2)]^2/x^2
=limx→0 2^(-x)*[(2^x-1)/x]^2
=limx→0 2^(-x)*[limx→0 (2^x-1)/x]^2
=2^0*[limx→0 2^xln2/1]^2
=1*[2^0*ln2]^2
=4*(ln2)^2.