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1. ### HELP!!! sin u= (4/5) 0<u<Pi/2?

sin(u) = 4/5 = y/z x^2 + y^2 = z^2 x^2 + 4...x^2 = 25 - 16 x^2 = 9 x = 3 1) cos(u) = x/z = 3/5 <==== positive since... to take the positive root. sin(u/2) = + √( (1-cos u)/2 ) sin(u/2) = √( (1- (3...

3 Answers · Science & Mathematics · 17/08/2011

2. ### If u dot (v x w) = |u||v||w|, show that u dot v = u dot w = v dot w = 0?

By definition u.v x w = |v x w| |u| cosθ where θ is the angle between u and v x w... where Θ is the angle between v and w. So u.v x w = |v||w| sinΘ |u| cosθ and this is equal to |u||v...

2 Answers · Science & Mathematics · 03/10/2009

3. ### Let U and V be subspaces of a vector space W.?

suppose u,v are in U∩V. since u.v are in U, u+v is in U, since U is a subspace. since u,v ...

2 Answers · Science & Mathematics · 04/06/2011

4. ### If u=sin^-1(√x^2+y^2) then x(∂u/∂x) + y(∂u/∂y)=?

u = arcsin[√(x² + y²)] ∂u/∂x = 1/√[1 - (x² + y²)] • x/√(x² + ...) / √[1 - (x² + y²)] = tan[u] Note that u = arcsin[√(x² + y²)] implies that sin[u...

1 Answers · Science & Mathematics · 18/07/2011

5. ### Solve for U in this equation?

Multiply everything by (u-1)(u-3) and then cancel identical terms to clear the fractions: (u+7...3) / (u-3) (u+7)(u-3) + (u-1)(u-3) = (u+3)(u-1) Multiply everything out: u^2 + 4u - 21 + u^2 - 4u + 3 = u^2 + 2u - 3 Combine terms: 2u^2 - 18...

4 Answers · Science & Mathematics · 09/05/2011

6. ### u, v and w are mutually perpendicular?

(u + v + w) · (u + v + w) = (u + v + w) · u + (u + v + w) · v + (u + v + w) · w = (u · u + v · u + w · u) + (u · v + v · v + w · v) + (u · w + v · w + w · w) = (u · u + 0 + 0) + (0 + v · v + 0) + (0 + 0 + w · w), since u,v,w are mutually perpendicular...

3 Answers · Science & Mathematics · 14/06/2015

7. ### What is sin u = 1/3 and sin v = 1/4?

sin(u) = 1/3 = y/z x^2 + y^2 = z^2 x^2 + 1^2 = 3^2 x^2 = 9 - 1 x^2 = 8 x = 2√(2) cos(u) = x/z = 2√(2)/3 sin(v) = 1/4 = y/z x^2 + y^2 = z^2 x^2 + 1^2 = 4^2...

4 Answers · Science & Mathematics · 06/11/2011

8. ### how do u know?

u dont u just feel it. like 4 me if i talk to someone,(a guy) for a while and i feel some sort of attraction, i just kinda get a crush on them and i know i like them

14 Answers · Family & Relationships · 14/10/2007

9. ### Solve the system of equations below by graphing them. what are the ordered pairs (u, b)?

u = -b + 21 u = -2b + 30 Check it out - both equations are ...u" already. Thus, -b + 21 = -2b + 30 -b + 2b = 30 - 21 b = 9. u = -b + 21 = -(9) + 21 = 12 u = -2b + 30 = -2(9) + 30 = 12 So, the ...

2 Answers · Science & Mathematics · 01/06/2010

10. ### do u think that everyone finds true love?

u will feel it all in u r heart...love is not all butterflies all day long. love...sad....so if u are able to be with someone through good or bad, then u know it is real love. there are alot of other things...

8 Answers · Family & Relationships · 05/07/2009