Archived threads in /sci/ - Science & Math - 1667. page

>>8083929
>>/x/

>>8083937
Hey I'm just asking for an explanation as to what I saw. No need to be a dick.

>>8083948
We don't fucking know, nigga. Probably just your autism playing tricks on you.

1) Memorize the graphs. Sin(x) is an odd function which crosses the origin. Cos(x) is an even function, et cetera. Also, sin(n*x) and cos(n*x) are both periodic with a period of 2pi/n.

2) Okay, let's talk about the angles of 30, 45, 60, and 90 degrees.

sin 30 = 1/2 (the square root of 1 divided by 2)
sin 45 = sqrt 2 / 2 (notice: the square root of 2 > the square root of 1)
sin 60 = sqrt 3 / 2 (notice: the square root of 3 > the square root of 2)
sin 90 = 1 = sqrt 4 /2 (notice: the square root of 4 > the square root of 3)

Do you see what's going on here? The sin function is increasing from 0 to 90 degrees, so we know to go from 1/2 to sqrt2/2 to sqrt3/3, etc. Then it decreases from 90 to 180 degrees. (You also need to know your quadrants to tell if it's positive or negative)

Cos(x) is basically the same thing, but it's DECREASING from 0 to 90 degrees, and then it becomes negative. In other words, cos(x) = sin (x+90 degrees)

cos (30 degrees) = sqrt 3/2

cos (45 degrees) = sqrt 2/2

Blah blah blah. It should seem pretty simple now, just practice.

>>8083938
**correction: sin(x) actually decreases from 90 degrees to 270 degrees, and cos(x) is decreasing from 0 degrees to 180 degrees.

>>8083938
Ok thanks.
Got any youtube video suggestions to supplement this advice

>>8083912
I thought it was pretty good as an intro to proofs, don't stick to the ideas as if they're gospel, but it helped me learn proofs.

>>8083912
It's excellent. Pick up Rudin's introductory text to accompany it so you can practice with real mathematics.

>>8083912
It exposes a lot of proofs by way of number theory. I found it boring and a bit dry. I didn't care to continually prove useless number theoretic results early on and lost interest. Also the proofs are just tedious and boring. I'd recommend discrete mathematics by epp or Rosen. It has a wide range of subjects and teaches proofs that'll help in higher level courses.

Cognitive science really has taken a turn for the worse

south korea, japan, and germany have the highest nat avg iqs of any countries

and they HAPPEN TO ALSO be the best 3 countries in the world at engineering...

china and se asia lag 5-10 points behind s kor and japan, which is why their engineering is not as good if not shit..

iq means alot, but physics ability is a better judge of g (general intelligence)

What are some reliable IQ tests and their cost?

>>8083709
It has been answered on /pol/ already.

>>8083719
t'wasn't

>>8083720
Yes, it was. You were just too dumb to understand the hint.

>>8083648
m8 most people with half a brain feel like that at some point

I say that as someone who's been programming since I was 12.

go whine somewhere else faggot
this isn't your personal blog space

>>8083648
How old are you now? You must be very old....
You're lazy. Unless you're going to die tomorrow, next week, month or year nothing is stopping you from becoming what you want. Just do it.

>>8083565
Longevity is a bit more complicated (and obviously an unsolved problem) than just "staying healthy". For example intense calorie restriction can help with longevity, but it's definitely not healthy in the short term.

Your grandparents dying at ~70 is pretty good conisidering that generation had the most retarded lifestyle.

You will probably live well past 70 if you keep up the exercise and dieting, what you really need to worry about is if you'll still have your mind and health by then. Being old fucking sucks.

>>8083594
When I'm idling, I sometimes do wonder if my mental health would still be the same at that age. My one fear is my consciousness fading away, which is also why I fear death. And being old puts you on the border of that. Which also makes if that research for preserving brain health will come around in the next twenty years. I don't want to lose all I know or who I am.

>>8083599
I have the same fears. What's fucked up is that we don't really understand it all.

I have a professor who's getting close to 90, he still smokes a pack of cigarrettes per day. In the 4 years I've known him the man was sharper than anyone else in the faculty, not only his work, but his wit in general conversation.

This year something suddenly changed inside him. He doesn't have any health issues, but talking to him you can clearly tell that his mind is starting to fade.

I'm scared guys ;_;

i know my english is bad

>>8083530
sin^2(pi*x)

>>8083530
[math]\frac{1+(-1)^n}{2}[/math]

first you need a model for the impact of immigrants on social welfare
to do that you first need to model the social welfare function
good luck with that

Im not looking specificly on social welfare, is there any index that would just indicate "This country can take this x of migrants in a year, because they can"

File: Capture.jpg (101KB, 963x642px) Image search: [Google]

101KB, 963x642px

come on guys I need bring BA tomorrow, I need to know how to determine what number migrants can take.

>>8083351
No.
That's why we should stop being chained to this fucking rock.

>>8083351
No.

We would probably fall into chaos and witness an extinction level event unlike anything other.

>>8083356
>>8083357
Okay, easier scenario.

We have to avoid it, not stop it dead in its tracks.

>>8083291
With your given value, n is 0. Just plug in and remember 0! is defined as 1.

Does the recursion formula not work for non-integers?

Induction.

>>8083240
7 as a starting point, streamline from here:
4 1oz
1 5oz
1 10oz
1 20oz

>>8083276
5
1 1oz
1 3oz
1 5oz
1 10oz
1 20oz

>>8083286
How are you gonna weigh 2 now?

1 20oz
1 10oz
1 5oz
1 2oz
2 1oz

would work, so that's 6

>>8083186
It is late may. How was it not a final?

>>8083208
I live in Bulgaria so finals go from June>July

>>8083186
> get histology book
> read histology book
> learn unique features of tissues


A book that I'd recommend is
Wheater's Functional Histology: A Text and Colour Atlas

no premeds here desu?

shameless bump

Anyone ever take it or have plans to take it? Looking for general advice and discussion.

self-bump 2 no regrets

>>8083143
>no premeds here desu?

Premed scum get all bullied back to hell where they belong.

>>8083087
you forgot "lemon squezyyy" and the end

>EZPZ LEMON SQUEEZYYY"

>>8083087
No one uses fucking QED just use the cube.

i use "rekt"