这个题是等于无穷吗?lim(x-->0)(1-cosx^2)/(sin^2xtan^2x)
2个回答
lim(1-cosx²)/(sin²xtan²x)
=lim2sin²(x²/2) / (x²*x²)
=2lim (x²/2)²/x^4
=1/2
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