## anonymous one year ago answered

1. amoodarya

domain of validity is when denominators $\neq 0$

2. anonymous

That'll help, it's also asking for the basic identity of that equation I think

3. amoodarya

$\cot(\theta)=\cos(\theta)\frac{1}{\sin(\theta)}\\\frac{\cos(\theta)}{\sin(\theta)}=\cos(\theta)\frac{1}{\sin(\theta)}\\sin(\theta)\neq0$

4. anonymous

yeesh that's a lot of thetas, is that all the steps?

5. amoodarya

yes and you can find where sin(theta)=0 ,then find domain (validity)