Let uvuv 4uv?(Simplify your? answers

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Let uvuv 4uv?(Simplify your? answers.)Find the magnitude of uvuvuvujkvijkA.B.295?(−3i177j177kC.177?(−3

=?2?,9? and =?9?,5?. Express 4+5in the form ??a,b?.

+5=

× and the unit vector parallel to × in the direction of ×.

=3i+5+5?, =−6−10−10

?0; no direction

295?; 1

+

+1

?)

177?; 1

i+

177j+1

177k?)

D.

?0; −3i+

177j+1

177k

 

Find all the first order partial derivatives for the following function.

?f(x,y)=lny7x8

A.

∂f∂x=−8x?; ∂f∂y=7y

B.

∂f∂x=−ln8x?; ∂f∂y=ln7y

C.

∂f∂x=−ln8y7x9?; ∂f∂y=ln7y6x8

D.

∂f∂x=7y?; ∂f∂y=

 

Find v•u.

v=1

29, 1

29 and u=1

29, −1

29

A.

0

B.

2

29i−2

29j

C.

1

29i−1

29j

D.