求极限limx→0tan∧2*2x/1-cosx
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求极限limx→0tan∧2*2x/1-cosx求极限limx→0tan∧2*2x/1-cosx 求极限limx→0tan∧2*2x/1-cosx1-cosx=1-(1-2sin²
求极限limx→0tan∧2*2x/1-cosx
求极限limx→0tan∧2*2x/1-cosx
求极限limx→0tan∧2*2x/1-cosx
1-cosx = 1-(1-2sin² (x/2))= 2sin² (x/2)
(x->0) lim tan²2x/(1-cosx)
= lim tan²2x/2sin² (x/2)
= lim (2x)²/2(x/2)²
= 4/(1/2)
=8
求极限limx→0tan∧2*2x/1-cosx
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