Which of the Following Functions Is Even? Select All That $y=-6 t^{2}$

Multiple Choice

Which of the following functions is even? Select all that apply.

A) $y=-6 t^{2}$
B) $y=-6 t^{12}-7 t^{8}$
C) $y=\sin (2 t)$
D) $y=\cos \left(3 t^{3}\right)$
E) $y=3 \sin ^{2}(t) +\cos (2 t)$
F) $y=6 t^{\frac{7}{9}}$