Hi, For the following problem I am having hard time trying to find the phase angle (alpha).
How to find the phase angle,
isnt that alpha = arctan(B/A) if A,B>0 ?
Solve the initial value problem
(where primes indicate derivatives with respect to t). Express your solution as the sum of two oscillations,
x(t) = (49/27)*cos(6t - ) + (5/27)cos(3t)
(Recall that must be between 0 and 2.)
But the phase angle is not right.