- #1

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^{O}with v=<3,4>??

can i let b=<x,y>, then

cos60=(3x+4y)/5sqrt(x

^{2}+y

^{2})

5sqrt(x

^{2}+y

^{2})=3x+4y

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- Thread starter hazellaw
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- #1

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can i let b=<x,y>, then

cos60=(3x+4y)/5sqrt(x

5sqrt(x

- #2

tiny-tim

Science Advisor

Homework Helper

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Hi hazellaw! Welcome to PF!

(have a square-root: √ and a degree: º )

^{O}with v=<3,4>??

can i let b=<x,y>, then

cos60=(3x+4y)/5sqrt(x^{2}+y^{2})

5sqrt(x^{2}+y^{2})=3x+4y

That'll certainly do it.

But easier would be

i] use <cosθ,sinθ> instead of <x.y>

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