Question

Please help please see photo

Answer 1

`\bf 2sin^2(\theta)+sin(\theta)=0\impliedby \textit{common factor} \\\\\\ sin(\theta)[2sin(\theta)+1]=0\implies \begin{cases} sin(\theta)=0\\\\ \theta=sin^(-1)(0)\\ ---------\\ 2sin(\theta)+1=0\\\\ sin(\theta)=(-1)/(2)\\\\ \theta=sin^(-1)\left( -(1)/(2) \right) \end{cases}`

check those angles with those values in your Unit Circle