Consider the Function

Express F(t) Using Unit Step Functions $\cos (6 \pi t) U_{6}(t)$

Multiple Choice

Consider the function

Express f(t) using unit step functions.

A) $\cos (6 \pi t) U_{6}(t)$
B) $\cos (6 \pi t) \left(1+U_{6}(t) \right)$
C) $\cos (6 \pi t) \left(U_{6}(t) -1\right)$
D) $\cos (6 \pi t) \left(1-U_{6}(t) \right)$