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/sci/ - Science & Math

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4599419 No.4599419 [Reply] [Original]

What is wrong with you when you have passed all mandatory calculus courses (with shitty grades), and still can't remember the multiplication tables, and can't count out change sometimes.

Also, 2 weeks after the exam, most of the things i had "learnt", or re-learnt from high school were already gone.

How do i prevent this from happening?
I rarely use math for anything, except the before mentioned things that also i fail at.

What do? Im frustrated with this.
I thought the point of going to college was being forced to learn boring things that you otherwise wouldn't.

>> No.4599438

>>4599419
>I rarely use math.
Right there.
You need to find a way to constantly practice.

>> No.4599444

Nothing that can be done with a calculator should be remembered.

>> No.4599454

>>4599438
Well, i do sometimes, but i guess i should force my self to do it more often.

But when will i ever use the tailor series for anything..

>> No.4599470

>>4599444
I usually cheat by using python as a calculator when im in front of a computer.

It's still kind of nice to be able to.. you know, do calculations without using a pen and paper.

But when i do, many times i end up with the wrong answer, because confuse myself and think 8 = 5 + 4 instead of 5 + 3 or some shit like that.

And then everything fails. And i can't understand why i come up with different results from counting on my fingers and doing this stuff in my head because it's all so "obvious".. and then.. oh shit i was wrong.
Suddenly, minutes have passed for dong something simple as adding up 8+15

>> No.4599491

>>4599419
Happens all the time to me too, OP.

Like this morning, I couldn't remember how to demonstrate that exp(x)/x tends to infinity when x tends to infinity.

>> No.4599502

>>4599491
It's because exp(x) grows faster than x right?

>> No.4599508

At least I can count out change. You're really fucked.

>> No.4599514

>>4599508
It has always been like this, i don't know why.

>> No.4599525

>>4599502
yes but that's not a demonstration

>> No.4599549

>>4599525
Ok.
Actually, i don't remember it at all..

But.. you know that ln(exp(x)/x) = x-ln(x).
And we know form computer science that
O(log(n)) grows slower than O(n).

>> No.4599551

>>4599491
>>4599502
lim motherfucker, have you heard of it?

>> No.4599569

>>4599551
Yeah i guess i have .. at some point in time.
In fact. This was one of the first assignments on the mid term in calc1 i think.

And i passed that shit 2 years ago.

That means, it was 2 years since i last used this for anything, because i've been trying to avoid math courses in order to keep my gpa at an acceptable level.

>> No.4599589

I'm a math major and still haven't memorized most sines, cosines and tangents

>> No.4599671

>>4599549
Now i found out on google how you do this.
http://en.wikipedia.org/wiki/L'H%C3%B4pital's_rule

Because you can't ∞ - ∞, for obvious reasons.

I had totally forgotten this. Maybe because I've actually only used it when i studied for that exam.