# Vector Projection Question (1 Viewer)

#### popjin

##### Member
Where am I going wrong here?

Question:
Given vector u = (-4cos30, 4sin30) and vector v = (6cos45, -6sin45) find projuv (projection of v onto u) in exact form

Working:

#### Eagle Mum

##### Member
Are you supposed to be dividing or multiplying by 16(?)

#### Etho_x

##### Well-Known Member
Are you supposed to be dividing or multiplying by 16(?)
Dividing if |u|^2 is 16

#### Etho_x

##### Well-Known Member
Where am I going wrong here?

Question:
Given vector u = (-4cos30, 4sin30) and vector v = (6cos45, -6sin45) find projuv (projection of v onto u) in exact form

Working:
View attachment 29788
I see what you’ve done, that 16 caused you a bit of an error. You should be multiplying by 1/16 (remember your fraction laws : 0)

#### popjin

##### Member
Are you supposed to be dividing or multiplying by 16(?)
I see what you’ve done, that 16 caused you a bit of an error. You should be multiplying by 1/16 (remember your fraction laws : 0)
Ah yup, that was it - I should have caught that. Thanks so much for the help!