[HELP!!!] Calc test!!!

[elositocandela]

ok people i'm having difficulties with my calc test and i have to finish it tomorrow now i dont want the answer i just want a similar example so i can learn how to do them.
so here is my first problem out of 12 of them

lnt-lnb
-------
t-b

lim
---
t ->b


i honestly dont know where to start on this one

[turbomaxx]

what the fuck when did they start putting letters in math??



no wonder i cant pass geometry...

[ACC0RD22]

instead of typing it out, could you take a picture?

[elositocandela]

i'll do some paint instead ok

[elositocandela]

here it is

[Straight Success]

Is that the entire problem. Did you copy the whole thing.

[elositocandela]

Is that the entire problem. Did you copy the whole thing.

yes i did copy the whole thing

[Straight Success]

So basically you have the lim as t approaches b of the natural log of t minus the natural log of b all divided by t minus b. Is this correct?

[elositocandela]

yes

[Night Wolf]

I dont get it.

[The G-Man]

Well if I am not a complete dumbass, you would substitute b for t and solve from there. Substituting that everything cancels out essentially leaving only implied 1 over 1. Making the answer 1.

I think.

Edit: Pretty sure that is wrong because t could never be b because it creates a zero in the denominator. Let me consult my Calc book and get back to you.

[Straight Success]

Is there any other info given?

[lil_dcb7]

you take calc?

ur one smart mexican.........

[Straight Success]

In CAlc you can have zero in the denom. when finding limits. Most times you use L'Hositals rule or multiple the whole thing by the inverse/ reciprocal of the numerator. So, is there any other info? L'Hosiptal rule states sum'um like if you have lim as.. Zero divided by Zero... Then use that rule. Wait I'll go look at my book.

[elositocandela]

nop, well ok since that one was hard as hell can somebody help me on this..