1. Geometric argument

Use a geometrical argument to show that R(a + b) = R(a)R(b)

and

Use a geometrical argument to show that R(a)R(b) = R(b)R(a)

2. Re: Geometric argument

Originally Posted by bakchormee
Use a geometrical argument to show that R(a + b) = R(a)R(b)

and

Use a geometrical argument to show that R(a)R(b) = R(b)R(a)
Haha, what? What is this stuff? You need to define things.

3. Re: Geometric argument

Rotations.
Geometric transformations using matrices.

4. Re: Geometric argument

In the absence of reflections, the order of rotations doesn't matter.
QED
:P