Does $y = 4 \cos ( 4 t )$ Satisfy $\frac { d ^ { 2 } y } { d t ^ { 2 } } + 4 y = 0$

Does $y = 4 \cos ( 4 t )$ satisfy $\frac { d ^ { 2 } y } { d t ^ { 2 } } + 4 y = 0$ ?