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Mathematics 9 Online
OpenStudy (anonymous):

Derivative of cosxsin3x

OpenStudy (kainui):

Take a guess and I'll help you figure it out. =D

OpenStudy (amonoconnor):

Do you know how to use the Product Rule?

OpenStudy (amonoconnor):

dy/dx = (u)v' + (u')v

OpenStudy (anonymous):

(cosx)(3cos3x)+(-sinx)(sin3x)

OpenStudy (amonoconnor):

Are you sure about the derivative of sin3x there?

OpenStudy (anonymous):

nope

OpenStudy (agent0smith):

Looks good to me.

OpenStudy (amonoconnor):

Are you thinking of/ using the "inside outside" rule?

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