设f(x)在(a,b)内可微,但无界,证明f'(x)在(a,b)内也无界
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设f(x)在(a,b)内可微,但无界,证明f''(x)在(a,b)内也无界设f(x)在(a,b)内可微,但无界,证明f''(x)在(a,b)内也无界设f(x)在(a,b)内可微,但无界,证明f''(x)在(
设f(x)在(a,b)内可微,但无界,证明f'(x)在(a,b)内也无界
设f(x)在(a,b)内可微,但无界,证明f'(x)在(a,b)内也无界
设f(x)在(a,b)内可微,但无界,证明f'(x)在(a,b)内也无界
反证法:
f(x)在(a,b)内可微,但无界,故f(x)在(a,b)内可导且连续,且至少在(a,b)的一端取无穷大极限.
若f'(x)在(a,b)内也有界,则存在正数M,使得
任取x属于(a,b),|f'(x)|
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