(1 point) (a) Using a trig identity, write x(t) = -2 cos(5t) - 5 sin(5t) using only one cosine function. x(t) = help (formulas) (b) Using a trig identity, write x(t) = 2 cos(5t) - 5 sin(5t) using only one cosine function. I(t) = help (formulas) (c) Using a trig identity, write x(t) = e (-2 cos(5t) - 5 sin(5t)) using only one cosine function in your answer. x(t) = help (formulas) Hint: Use the trigonometric identity A cos(wt ) + B sin(wt) = C cos(wt - y) where C = VA2 + B2, sin(y) = = and cos(y) = 4