作者TaiwanFlight (飞翔吧 ,台湾!!)
看板trans_math
标题Re: [微分] 76淡江
时间Thu Dec 27 16:36:40 2007
※ 引述《bitchdog (PEaCE)》之铭言:
: use the Mean Value Theorem to find
: lim [ sin (√(x+4) - sin√x )
: x→∞
Set f(x) = sin(x) , then f(x) , is diff. in |R , and conti. in |R ,
存在 c 属於 |R 使得 |f'(c)||(√(x+4) - √x)| = |sin√(x+4) - sin√(x)|
lim [ sin (√(x+4) - sin√x ) = lim |f'(c)||√(x+4) - √(x)|
x→∞ x→∞
= lim |f'(c)|*0 = 0
x→∞
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