/sci/ - Science & Math

[Swordy !44eGP7AZwo No.2200490]

i have a pretty weak trig background. what sorcery is this?


captca: societe dicley

[Anonymous No.2200504]

That shit doesn't make sense. Is "sin" supposed to be "x"? And is there supposed to be a "such that" in there somewhere?

[Krakengineer !!5XY+x7grkpt No.2200505]

It is dangerous to go alone take this.

[Swordy !44eGP7AZwo No.2200507]

>>2200504
sln is solutions.
find all solutions in the interval of 0 to 2pi

[Anonymous No.2200509]

>>2200505
shut up, you didn't even know you could do multiple initializations in a C for-loop.

[Anonymous No.2200510]

factrise to cos x (cos (x) -2) = 0

cos x = 0 or cos (x) = 2

second has no real values

so cos x = 0 is solved as x = pi/2 and 2pi/2 or 90, 270 in degrees

if you want sin of those values you have 1 and -1

[Anonymous No.2200511]

>>2200505
My formula sheet!

[Anonymous No.2200513]

>>2200510
> factrise
sure is krakengineer in here

[Anonymous No.2200517]

>>2200505
only an engineer would memorize all these rules and not derive them from euler's formula

And this problem doesn't even need these identities.

[Anonymous No.2200516]

let u = cos(x). You'll get a nice quadratic equation in terms of u.

[Anonymous No.2200515]

>>2200510
typo. should be 3pi/2 not 2pi/2

[Anonymous No.2200514]

Well, if you think of cos(x) as the variable, it's actually a quadratic equation:

y^2 - 2y = 0, where y = cos(x)

The solutions are y = 0 and y = 2.

So the solutions are when cos(x) = 0 or cos(x) = 2.

Well, cos(x) can never be 2, so don't worry about that one.

So our solutions happen when cos(x) = 0.
The solutions are x = pi/2 and x= 3pi/2

[Anonymous No.2200521]

>>2200509
lol what?
>>2200505
geez ur an idiot, now wander u need a ch8 sh8

[Krakengineer !!5XY+x7grkpt No.2200522]

>>2200509
You again.

Try doing multiple initialisations in a C for loop using Small Device C Compiler, any compiler from Microchip, or Amsterdam Compiler. Its not legal.

[Anonymous No.2200527]

>>2200522
whoops, forgot my standard disclaimer

> inb4 you try to sound overly technical in order to compensate

inafter you try to sound overly technical in order to compensate
sure is compensating around here

[Anonymous No.2200538]

>>2200513
nope
don't include me in your retarded dick war

[Swordy !44eGP7AZwo No.2200540]

>>2200510
yeah thats pretty much it. thanks.

captcha: school, turzon

[Anonymous No.2200553]

>>2200522
I just tried it. It works

[Anonymous No.2200586]

>>2200522

BITCHES DON'T KNOW ABOUT MY COMMA OPERATOR

[Anonymous No.2200595]

>>2200586

Or apostrophes. Any true Engineer knows that typos can cost you millions or dollars.

[Krakengineer !!5XY+x7grkpt No.2200661]

>>2200595 millions or dollars.
>> or