1. The problem statement, all variables and given/known data sinӨ + cosӨ =4/3 ,, then sin2Ө = .... ? 2. Relevant equations sin2Ө = 2cosӨsinӨ or any trigonometry functions... 3. The attempt at a solution I tried to write sinӨ + cosӨ =4/3 in the form of cosӨsinӨ but couldn't.. is there a possible way to solve it ?