Q.
Let $\hat{a}$ and $\hat{b}$ be two unit vectors such that $|(\hat{a}+\hat{b})+2(\hat{a} \times \hat{b})|=2$. If $\theta \in(0, \pi)$ is the angle between $\hat{ a }$ and $\hat{ b }$, then among the statements :
$( S 1): 2|\hat{ a } \times \hat{ b }|=|\hat{ a }-\hat{ b }|$
$( S 2)$ : The projection of $\hat{ a }$ on $(\hat{ a }+\hat{ b })$ is $\frac{1}{2}$
Solution: