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Mathematics 38 Online
OpenStudy (anonymous):

can someone please help me find the magnitude of the vector v(t) = <-7sin^2(t), Sqrt(3)cos(t), -2sin(t)>

OpenStudy (dumbcow):

\[|v| = \sqrt{x^2 +y^2 +z^2}\]

OpenStudy (anonymous):

Lemme show you what I have (; The solution was throwing me off.

OpenStudy (anonymous):

mag v = sqrt( 49sin^2(t) + 3cos^2(t) + 4sin^2(t) )

OpenStudy (anonymous):

so sqrt ( 53sin^2(t) + 3cos^2(t) )

OpenStudy (dumbcow):

shouldn't be 49sin^4

OpenStudy (anonymous):

Im sorry that should have been v(t) = <-7sin(t) , sqrt(3) cos t , -2sin(t)>

OpenStudy (dumbcow):

oh well then you are correct :)

OpenStudy (anonymous):

the solution somehow has sqrt( 53 sin^2(t) + 3)

OpenStudy (anonymous):

So I think I am missing something somewhere );

OpenStudy (dumbcow):

they sub "1 - sin^2" for cos^2

OpenStudy (anonymous):

hmmm wouldnt that make it 50sin^2(t) + 3?

OpenStudy (anonymous):

Im gonna try to post a photo to make sure I didnt mess this one up lol.....my friend in the same class is coming to the same problem though.

OpenStudy (anonymous):

Sorry battteries dead lol.

OpenStudy (dumbcow):

yes answer should be sqrt(50sin^2 + 3)

OpenStudy (anonymous):

thank you (;

OpenStudy (anonymous):

What do you do during the day? Teacher? Engineer?

OpenStudy (dumbcow):

private math tutor part time .... delivery driver full time

OpenStudy (dumbcow):

not quite smart enough to be engineer tried teaching, not my fit .... do better in one-on one setting

OpenStudy (anonymous):

math degree then?

OpenStudy (dumbcow):

yeah with emphasis on computational math (i sucked at high level math proofs)

OpenStudy (anonymous):

Well I really appreciate your help (;

OpenStudy (dumbcow):

yw

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