求lim(x→0)1-COSX/IN(1-X的平方)
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求lim(x→0)1-COSX/IN(1-X的平方)
求lim(x→0)1-COSX/IN(1-X的平方)
求lim(x→0)1-COSX/IN(1-X的平方)
用等价无穷小替换
x→0时,1-COSX→x²/2,
ln(1-x²)→ -x²
则原式=lim(x→0)(x²/2) / (-x²)
= -1/2
求lim(x→0)1-COSX/IN(1-X的平方)
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