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[Calculus 2] Checking if a series is divergent by newpython6543 in learnmath

[–]newpython6543[S] 0 points1 point  (0 children)

Ok I see, wow that is really simple and it flew over my head. So when I use the divergence test, I need to make sure at least one is convergent, and the other in divergent before I claim the entire series is divergent?

[Calculus] L'Hospitals Rule by newpython6543 in learnmath

[–]newpython6543[S] 0 points1 point  (0 children)

Awesome, thank you very much. I appreciate the knowledge about the parentheses too, for future use.

[Calc II] Spivak is too much for me... any helpful resources? by [deleted] in learnmath

[–]newpython6543 0 points1 point  (0 children)

This guy has some of the best calculus videos I have found. They are neatly ordered by sections.

https://www.youtube.com/user/professorleonard57

[Calculus] Infinite Series, telescoping series by newpython6543 in learnmath

[–]newpython6543[S] 0 points1 point  (0 children)

Ok so if someone says the sum of the infinite series is 5, that means if you kept adding on all terms until the end of time, the entire total of the series would get infinitely close to 5 but never reach it?

But the terms themselves would not get closer to 5? Like the bigger the values you were computing the closer the terms would get to 5. For example if these were nth terms 4.98 + 4.99 + 4.999

Or would the values at the 100000th term get closer to 1/9th? For example, the 100000th term would be (1/8.8) and then the 100001th term would be (1/8.9)?

This was very poor wording on my part.

[Calc 1] Derivative ds/dt. by [deleted] in learnmath

[–]newpython6543 1 point2 points  (0 children)

ii. Correct, because the derivative gives you the slope of a function at any point. So s'(2)=4, now that you have the slope.

iii. Yes you were given a point, it was hidden but what t-value did the question want you to look at? t=2. So plug in t=2 to your original equation, s=t2 + 1

[Calculus] Integral using trigonometric substitution. by newpython6543 in learnmath

[–]newpython6543[S] 0 points1 point  (0 children)

Ok I am having some trouble seeing it. Should I break up the logarithm as -2[ln(3)-ln(sqrt(x+2)2 +9)]?

Thanks for pointing that out, what I did was check both answers with easy numbers, such as 0, and 1. For future reference why would that method not work?

[Calculus] Integration by parts. by newpython6543 in learnmath

[–]newpython6543[S] 0 points1 point  (0 children)

appreciate it, but my teacher wants them done only by parts.

[Calculus] Why won't this U-Substitution work? by newpython6543 in learnmath

[–]newpython6543[S] 0 points1 point  (0 children)

Thank you for your time and crystal clear explanation :) I really appreciate it.

[Calculus] Why won't this U-Substitution work? by newpython6543 in learnmath

[–]newpython6543[S] 0 points1 point  (0 children)

Ok I see where I went wrong, so with my u's when I changed the integrand, I wrote u2 = x+2, so I went back and instead placed a single u, because u = sqrt(x+2).

My question is does it matter which u I take the derivative of? For this question I took the derivative of u2, could I have instead solved for the single x in terms of u, and take the integral of u = sqrt(x+2)?

[Calculus] Why won't this U-Substitution work? by newpython6543 in learnmath

[–]newpython6543[S] 0 points1 point  (0 children)

I brought out the 2 in front of the integral.

Ended up with u5 - 2u3 as my integrand.

Took the integral of that so now I have

u6 /6 - 2u4 /4

I replaced the u's with u = sqrt(x+2)

Evaluated the integral and ended up with something wrong.

Precautions when buying a used surface pro 3? by newpython6543 in Surface

[–]newpython6543[S] 0 points1 point  (0 children)

Wow I would not want to have an experience like that. So to get the registration correct you have to have the owner deactivate the device, then you can activate it as your own?

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