因为secx=1/cosx
所以左边=lim(x→0)2tanx/(6x)*1/cos^2(x)
=1/3lim(x→0)tanx/x*lim(x→0)1/cos^2(x)
=1/3lim(x→0)tanx/x
x→0 lim (2sec^2(x)tanx)/6x= 1/3 x→0 lim tanx/x
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