Thread for Random and Brilliant Minds!

[Vellu]

Just got back from math exam. I almost got everything down but then I got stuck in a fourier series problem when I would've had to integrate (t*sin(nt) dt). I knew that there's this formula: , but I just couldn't get it to my head
edit: I already got the results, 27/30 But that integration thingie still pisses me off, full points if I had remembered it

[rgaede]

Calc 2, I'm guessing. And out of 30 points, what kind of bs is that. My math exams are 4-5 problems out of 100 points, and if I screwed up in one spot (even something as small as a sign error) I got the entire problem wrong... Oh well, if your in calc 2, the good news is that calc 3 is loads easier.

[DW434]

i remembered pi to the 69th decimal point i cant really prove it though cuase youll think its copy paste

3.1415926535897932384626433832795028841971693993751058209749445923078

[Vellu]

Calc 2, I'm guessing. And out of 30 points, what kind of bs is that. My math exams are 4-5 problems out of 100 points, and if I screwed up in one spot (even something as small as a sign error) I got the entire problem wrong... Oh well, if your in calc 2, the good news is that calc 3 is loads easier.

Well here in Finland the exams are usually 5 problems, each worth 6 points. The grading depends on the teacher, some give points easier than others.
I think this is my last compulsory math course, but that was just a mid-term exam. The course continues to Fourier- and Z-transforms and I have no phucking idea what those are

[cpt_Slow]

Thought I'd bring this thread back from the dead for a system of equations I would like to solve.

cos(a)cos(b)=x
cos(c)sin(a)+sin(c)sin(b)cos(a)=y
sin(c)sin(a)-sin(b)cos(a)cos(c)= z

I want to find a, b and c in terms of x, y and z.

Anybody know the best way to go about it?

[Mikeyyart10]

i think i might be more stupid than i first thought.
Hate maths, science like english but still suck at it.

[Pumaxcs]

If Wolfram Alpha doesn't know then I don't know.