已知x→0时,(1+ax^2)^(1⼀3)-1与cosx-1是等价无穷小,则常数a=? 要详细阶梯过程!谢谢

2025-01-20 01:43:28
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回答1:

x→0时,(1+ax^2)^(1/3)-1≈1+ax²/3-1=ax²/3
cosx-1≈1-½sin²x-1=½sin²x≈x²/2
ax²/3=x²/2
a=3/2