Solve the equation given.

Enter all solutions, in degrees, that lie in the interval $\displaystyle {\left[{0}^{\circ},{360}^{\circ}\right)}$. Do not enter the degree sign. If there are more than one angle, separate them by a comma.

$\displaystyle {2}{{\cos}^{{2}}\gamma}+{9}{\cos{\gamma}}+{4}={0}$

$\displaystyle \gamma$ = Preview Question 6