- #1

gunnar

- 40

- 0

I need to find all the unit vectors x in R3 that make an angle of pi/3 with each of the vectors above.

Can someone please help with this problem?

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- Thread starter gunnar
- Start date

- #1

gunnar

- 40

- 0

I need to find all the unit vectors x in R3 that make an angle of pi/3 with each of the vectors above.

Can someone please help with this problem?

- #2

vincentchan

- 609

- 0

hint:

use dot product to find the angle between vectors

use dot product to find the angle between vectors

- #3

Hurkyl

Staff Emeritus

Science Advisor

Gold Member

- 14,967

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- #4

gunnar

- 40

- 0

The angle between the unit vectors and each of the given vectors is supposed to be pi/3 also. So I used the dot product to calculate

c=sqrt(2) since the unitvector has length 1 and both the given vectors have the length sqrt(2)

Don't seem to be able to get the right answear.

The correct answear is (1/sqrt(2), 1/sqrt(2), 0) only one vector.

How to reach that conclusion I have no idea

- #5

da_willem

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