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## Homework Statement

I'm given 2 unit vectors a_x and a_theta.

I need to find the dot product between the two.

## Homework Equations

Conversion from Cylindrical to Cartesian

x = r * sin(theta)

y = r * cos(theta)

z = z

Conversion from Cartesian to Cylindrical

r = sqrt(x^2 + y^2)

theta = tan^-1(x/y)

z = z

## The Attempt at a Solution

I'm just curious if you were my teacher what kind of answer would you want?

I think the point he's trying to prove is that theta is the angle between the x and y plane but I have no idea how to put that mathematically with the given formulas..