(1 point)
(a) Using a trig identity, write y(t) = 4 cos (7t) - 4 sin(7t) using only one cosine function.
y(t) =
(b) Using a trig identity, write y(t) = -4 cos (7t) - 4 sin (7t) using only one cosine function.
y(t)
=
help (formulas)
help (formulas)
(c) Using a trig identity, write y(t) = 4 cos (7t) + 4 sin(7t) using only one cosine function in your answer.
y(t)
=
help (formulas)
(d) Using a trig identity, write y(t) = -4 cos (7t) + 4 sin(7t) using only one cosine function in your answer.
y(t)
help (formulas)
Fig: 1