Entered -[cos(9*t)+5*sqrt(1-([cos(9*t)]^2))] sqrt(26)*cos(9*t-(5/[sqrt(26)])) At least one of the answers above is NOT correct. 1 of the questions remains unanswered. (1 point) (a) Using a trig identity, write x(t) = - (cos(9+)) + 5 sin(9+) using only one cosine function. x(t) (cos(9t)+5sqrt(1-cos^(2)(9t))) help (formulas) (b) Using a trig identity, write x(t) = cos(9+) + 5 sin(9+) using only one cosine function. x(t) ==== || help (formulas) Answer Preview -(cos(94) +5√/1-cos² (94)) 3t (c) Using a trig identity, write x(t) = e ³t (- (cos(9t)) +5 sin(9+)) using only one cosine function in your answer. x(t) help (formulas) Hint: Use the trigonometric identity 5 √(0) 26 cos 9t 26 A cos(wt) + B sin(wt) = C cos(wt - y) where C = √A² + B2, sin(y) and cos(7) = . Note: You can earn partial credit on this problem. Result correct incorrect incorrect