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/sci/ - Science & Math

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File: 12 KB, 868x637, AngleBetween2Vectors.png [View same] [iqdb] [saucenao] [google]
7299415 No.7299415 [Reply] [Original]

Hey
I'm looking for a explanation on some pretty basic math, but I just cant seem to get my head around it.
I'm going to my math exam this tuesday and one of the subjects is Vectors in 3D and in that subject we need to calculate the angle between 2 vectors.
So it's pretty much just putting in numbers and calculating but one of the steps confuses me.
How does 3 / (3 * sqrt(2) ) = 1 / 2 * sqrt(2)?
The exam is without any calculators and I used maple only to check this one out by the way
Thanks

>> No.7299431

>>7299415
>3/3sqrt(2)
>1/sqrt (2)
>2^(-1/2)
>2^(1/2)/2
>sqrt (2)/2

>> No.7299435
File: 9 KB, 543x595, StepItUp.png [View same] [iqdb] [saucenao] [google]
7299435

come on op even those CS kiddies scould do this

>> No.7299436

>knows how to use Maple and vector/multivariate calculus
>can't rationalize a fraction

What the fuck, OP?

>> No.7299441

>>7299435
oops the fourth step should be multiplied be 1/sqrt(2) * sqrt(2)/sqrt(2)

>> No.7299452

>>7299435
>>7299441
Thanks, helps a lot.
>>7299436
I know man. This one just fucked my head, too much math these days I guess.

>> No.7299534
File: 235 KB, 582x600, Ragecopy.png [View same] [iqdb] [saucenao] [google]
7299534

>>7299436
this