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14:55 IV.4 Complex exponentials IV.4 Complex exponentials	IV.4 Complex exponentials complex numbers differential equations solution root times sine cosine t. i. roots c1 omega form unit modulus series b2 b1 euler equals power equation From Tobin Driscoll 0 likes 82 plays 0
10:14 II.9 Undetermined coefficients II.9 Undetermined coefficients	II.9 Undetermined coefficients differential equations times solution function cosine sine polynomial t. coefficients problem b1 minus equation side hand degree combination coefficient omega frequency 3b From Tobin Driscoll 0 likes 115 plays 0