TrueTears question thread

[/0]

If you look at a parallelogram, ABDC (labelled clockwise), then there is no way the directions OA, OB, and OC can add to get OD...?

[TrueTears]

hmmm its a Q in the heinnemen book, it says exactly that

[Mao]

how is BC a diagonal...?

[TrueTears]

how is BC a diagonal...?

i know ... there must be something wrong with the q.....

[TrueTears]

Ok, nvm that question, my teacher just said that question was wrongly worded -_-

[TrueTears]

Also this question:

if a = 2i - 2j + k and b = - i - j - 5k find a unit vector perpendicular to a and b

[Mao]

let







solving simultaneously to get the three coefficients.

[TrueTears]

thanks mao

[Flaming_Arrow]

sorry for hijacking the thread but how do you know they all equal 1?

[TrueTears]

it says unit vector

[Flaming_Arrow]

it says unit vector

oops didn't pick that up

[TrueTears]

prove these identities:

a)
b)

many thanks!

[vce08]

prove these identities:

a)
b)

many thanks!

i got the first one



















as required

[vce08]

prove these identities:

a)
b)

many thanks!

here is the second one

















as required

i'm still new to this latex thing so i am quite slow at typing the answers up

[TrueTears]

thanks very much table!