Entered Answer Preview Result Message sqrt(26)*cos((1/5)+6*t) √26 cos (+) + 6t incorrect This answer is equivalent to the one you just submitted. -[sqrt(26)]*cos((1/5)-6*t) -(√26) cos 6t incorrect incorrect 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) = 5 cos(6t) - sin(6t) using only one cosine function. x(t) sqrt(26)cos(1/5+6t) help (formulas) (b) Using a trig identity, write x(t) = -5 cos(6t) - sin(6t) using only one cosine function. x(t)=-sqrt(26)*cos(1/5-6t) help (formulas) (c) Using a trig identity, write x(t) = e 4t (5 cos(6t) - sin(6t)) using only one cosine function in your answer. x(t) = Hint: help (formulas) Use the trigonometric identity A cos(wt) + B sin(wt) = C cos(wt) where C = √√A² + B², sin(y) = and cos(7) = .