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10.
由∫[0:x](cost-1)dt与xⁿ是同阶无穷小
令lim∫[0:x](cost-1)dt/xⁿ=k,(k为常数)
x→0
lim∫[0:x](cost-1)dt/xⁿ
x→0
=lim(sinx-x)|[0:x]/xⁿ
x→0
=lim[(sinx-x)-(sin0-0)]/xⁿ
x→0
=lim(sinx-x)/xⁿ
x→0
=lim[x-(1/6)x³-x]/xⁿ
x→0
=lim (-1/6)x³⁻ⁿ
x→0
3-n=0
n=3
n的值为3
由∫[0:x](cost-1)dt与xⁿ是同阶无穷小
令lim∫[0:x](cost-1)dt/xⁿ=k,(k为常数)
x→0
lim∫[0:x](cost-1)dt/xⁿ
x→0
=lim(sinx-x)|[0:x]/xⁿ
x→0
=lim[(sinx-x)-(sin0-0)]/xⁿ
x→0
=lim(sinx-x)/xⁿ
x→0
=lim[x-(1/6)x³-x]/xⁿ
x→0
=lim (-1/6)x³⁻ⁿ
x→0
3-n=0
n=3
n的值为3
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