Question

Defferentiate y = e^4x cosx

Answer 1

e^4xcosx * (4cosx - 4xsinx)

Answer 2

Answer is -e^4x sinx + 4e^4x cosx but i'm still confused.

Answer 3

but y r u confused

Answer 4

okay i think i get it better now. so, u = e^ 4x u' = 4e^4x, v = cosx, v' = -sinx then I use u'v +v'u?

Answer 5

yes

Answer 6

Does it matter if i have it backwards? like 4e^4x cos-e^4x sinx instead of -e^4x sinx + 4e^4x cosx?

Answer 7

no

Answer 8

Okay. Thanks!

Answer 9

mention not