If $\lim _ { x \rightarrow 0 } \frac { \alpha e ^ { x } + \beta e ^ { - x } + \gamma \sin x } { x \sin ^ { 2 } x } = \frac { 2 } { 3 }$, where $\alpha , \beta , \gamma \in R$, then which of the following is NOT correct?\\
(1) $\alpha ^ { 2 } + \beta ^ { 2 } + \gamma ^ { 2 } = 6$\\
(2) $\alpha \beta + \beta \gamma + \gamma \alpha + 1 = 0$\\
(3) $\alpha \beta ^ { 2 } + \beta \gamma ^ { 2 } + \gamma \alpha ^ { 2 } + 3 = 0$\\
(4) $\alpha ^ { 2 } - \beta ^ { 2 } + \gamma ^ { 2 } = 4$