(a) Using a trig identity, write z(t) = -5 cos(4t) - 3 sin(d4) using only one cosine function. z(t) = help (formulas) (b) Using a trig identity, write z(t) = 5 cos(4t) – 3 sin(4t) using only one cosine function. z(t)- help (formulas) (c) Using a trig identity, write z(t) =e"(-5 cos(4t) - 3 sin(4t)) using only one cosine function in your answer. z(t) = help (formulas)

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