Question

Please please use explanation with answer

Answer 1

`\large\boxed{\theta=-(\pi)/(4)+k\pi\ or\ \theta=k\pi}\ for\ k\in\mathbb{Z}`

Explanation:

`\tan^2\theta+\tan\theta=0\\\\\tan\theta(\tan\theta+1)=0\iff\tan\theta=0\ \vee\ \tan\theta+1=0\\\\\tan\theta=0\Rightarrow \theta=k\pi\ \text{for}\ k\in\mathbb{Z}\\\\\tan\theta+1=0\qquad\text{subtract 1 from both sides}\\\\\tan\theta=-1\Rightarrow\theta=-(\pi)/(4)+k\pi\ \text{for}\ k\in\mathbb{Z}`