- #1

- 908

- 0

## Homework Statement

Find the angle between radius vector of the point M(6,2,9) and:

a)x axis ; b)y axis ; c)z axis

## Homework Equations

[tex]cos(\vec{a},\vec{b})=\frac{\vec{a} \vec{b}}{|\vec{a}||\vec{b}|}[/tex]

## The Attempt at a Solution

I tired with

[tex]cos\alpha=\frac{(6,2,9)(6,0,0)}{\sqrt{121}\sqrt{36}}[/tex]

but it is not like in my textbook results...