How does $dfrac{f(x)}{g(x)}approx dfrac{f'(a)(x-a)+f(a)}{g'(a)(x-a)+g(a)} implies dfrac{f'(a)}{g'(a)}$?












2












$begingroup$


Can someone please unveil the steps for this answer?




Thus
$$
frac{f(x)}{g(x)}approx color{red}{frac{f'(a)(x-a)+f(a)}{g'(a)(x-a)+g(a)}}.
$$

Taking the limit of the right hand side gives $dfrac{f'(a)}{g'(a)}$.




Because $x to a iff x- a to 0$, then



$$lim_{x to a} color{red}{dfrac{f'(a)(x-a)+f(a)}{g'(a)(x-a)+g(a)}} = dfrac{f'(a)times0 + f(a)}{g'(a)times0 + g(a)}$$










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  • 5




    $begingroup$
    In that reference, one is applying this to the case $f(a)=f(b)=0$ (in order to justify the Hospital).
    $endgroup$
    – Lord Shark the Unknown
    Jan 12 at 3:29
















2












$begingroup$


Can someone please unveil the steps for this answer?




Thus
$$
frac{f(x)}{g(x)}approx color{red}{frac{f'(a)(x-a)+f(a)}{g'(a)(x-a)+g(a)}}.
$$

Taking the limit of the right hand side gives $dfrac{f'(a)}{g'(a)}$.




Because $x to a iff x- a to 0$, then



$$lim_{x to a} color{red}{dfrac{f'(a)(x-a)+f(a)}{g'(a)(x-a)+g(a)}} = dfrac{f'(a)times0 + f(a)}{g'(a)times0 + g(a)}$$










share|cite|improve this question











$endgroup$








  • 5




    $begingroup$
    In that reference, one is applying this to the case $f(a)=f(b)=0$ (in order to justify the Hospital).
    $endgroup$
    – Lord Shark the Unknown
    Jan 12 at 3:29














2












2








2


1



$begingroup$


Can someone please unveil the steps for this answer?




Thus
$$
frac{f(x)}{g(x)}approx color{red}{frac{f'(a)(x-a)+f(a)}{g'(a)(x-a)+g(a)}}.
$$

Taking the limit of the right hand side gives $dfrac{f'(a)}{g'(a)}$.




Because $x to a iff x- a to 0$, then



$$lim_{x to a} color{red}{dfrac{f'(a)(x-a)+f(a)}{g'(a)(x-a)+g(a)}} = dfrac{f'(a)times0 + f(a)}{g'(a)times0 + g(a)}$$










share|cite|improve this question











$endgroup$




Can someone please unveil the steps for this answer?




Thus
$$
frac{f(x)}{g(x)}approx color{red}{frac{f'(a)(x-a)+f(a)}{g'(a)(x-a)+g(a)}}.
$$

Taking the limit of the right hand side gives $dfrac{f'(a)}{g'(a)}$.




Because $x to a iff x- a to 0$, then



$$lim_{x to a} color{red}{dfrac{f'(a)(x-a)+f(a)}{g'(a)(x-a)+g(a)}} = dfrac{f'(a)times0 + f(a)}{g'(a)times0 + g(a)}$$







limits






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edited Jan 12 at 3:20









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asked Jan 12 at 3:18









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  • 5




    $begingroup$
    In that reference, one is applying this to the case $f(a)=f(b)=0$ (in order to justify the Hospital).
    $endgroup$
    – Lord Shark the Unknown
    Jan 12 at 3:29














  • 5




    $begingroup$
    In that reference, one is applying this to the case $f(a)=f(b)=0$ (in order to justify the Hospital).
    $endgroup$
    – Lord Shark the Unknown
    Jan 12 at 3:29








5




5




$begingroup$
In that reference, one is applying this to the case $f(a)=f(b)=0$ (in order to justify the Hospital).
$endgroup$
– Lord Shark the Unknown
Jan 12 at 3:29




$begingroup$
In that reference, one is applying this to the case $f(a)=f(b)=0$ (in order to justify the Hospital).
$endgroup$
– Lord Shark the Unknown
Jan 12 at 3:29










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